AMC86Kid Posted June 14, 2020 Share Posted June 14, 2020 Can anyone tell me how to wire the Oil Pressure Gauge ? I’m doing it from scratch, what type of sensor do I have to connect it to , and when wiring it where should you put the fuse ? Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted June 14, 2020 Share Posted June 14, 2020 This is what the sensor should like, or a bigger gm styleJust remove the idiot light switch from the side of the oil filter housing then thread this in, one wire sender , there should be a wire already there. I have no clue why you have to wire it all by hand, the wiring diagram I uploaded last week should break down what went to those connectors.Personally I’d cut bait on the factory gauges if it’s this jacked up. Buy a gauge kit to find out what the motor is doing, keep the Speedometer.I’m going to swap in a ax15 and np231 just to get accurate speed with bigger tires.The 207 uses a reverse cut GM style speedometer gear which is impossible to find now. Plus there’s a ton more support for the 231 over the 207, 207 never failed me and has a monster chain the 231 only gets as HD a upgrade. Anyway on this if you can’t make it work easily, do something different. Not worth the effort you have to put in to craft it by hand.Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted June 14, 2020 Share Posted June 14, 2020 Sorry that the wrong photo but correct style, it’ll look like with one spade terminalSent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 ok so how does the oil pressure sender work does it have to be touching the oil ? does it run off of resistance? Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 ok i looked up how the oil pressure sender that you showed in the pic works it has 3 pins and the middle one is basically a variable resistor my question now is how should i wire it to the gauge what pin behind the gauge gets power and which one gets signal from the sender Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 i will look at my rebuilt engine and see if one of the sensors on it can be used for the gauge Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 Ok I took a look around and here what it’s got these on top of the engine that look like there water temp related The oil oil filter is just capped off with a plug And I found these two that look like they might work this is on the oil pan on the right side of the engine (driver side) This one is in the middle of the engine on the passenger side Does anyone know know if I can use these to connect to the oil pressure gauge ? Link to comment Share on other sites More sharing options...
jdog Posted June 14, 2020 Share Posted June 14, 2020 Nope, it be the one at the oil filter Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 i see that but I'm trying to figure out what the other two sensors are for and even if i go buy a new 2.8 oil pressure sender how do i wire it to the gauge? Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 Ok so I found this so it opperates between 0 - 80 psi and from 1 ohm - 88 ohms so as the pressure goes up the resistance does too and it looks like one pin on the back of the gauge gets positive another gets negative and the third gets signal from the sender now i need to figure out which pin it is that the sender goes to Link to comment Share on other sites More sharing options...
jdog Posted June 14, 2020 Share Posted June 14, 2020 The one in the pan is either a oil temp or level sensor, the one in the block is probably a knock sensor, id just go get a aftermarket gauge set, run a mechanical oil and temp gauge, a bit more accurate than the electric dash ones Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 ok than i will just go buy a new sensor https://www.oreillyauto.com/detail/b/standard-ignition-5753/lighting---electrical-16777/sensors-16480/engine-sensors-25049/oil-pressure-sensor-switch-12875/9a4df8f34742/standard-ignition-1-terminal-oil-pressure-switch/ps15/5815754?q=PS15&pos=0 i will see if this operates between 0 - 88 ohms and if it does than i just gotta figure out how to connect it to the gauge Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted June 14, 2020 Share Posted June 14, 2020 Ps155 is the correct style, one spade connector. The 2.8 harness should have a wire for it. What’s going on with your dash? Is the harness messed up? Just the cluster? you should just need to swap the sensor into the oil filter housing and connect it. The feed going to the instrument cluster shouldn’t need anything else. Look at the wiring diagram from last week trace where the lines comes in to the plug and tap a feed from there. The fuse box already has a fuse for instruments. If working the rest of the cluster should work. The best way to make to work reliably have the original engine and dash harness be in good order then drop a good 88-90 cluster in. Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
Eagle Posted June 14, 2020 Share Posted June 14, 2020 3 hours ago, AMC86Kid said: ok i looked up how the oil pressure sender that you showed in the pic works it has 3 pins and the middle one is basically a variable resistor my question now is how should i wire it to the gauge what pin behind the gauge gets power and which one gets signal from the sender The sensor is a variable resistor, rated from 0 to 88 ohms. It should have a single contact. Power goes through the gauge, then grounds through the sensor. Oil doesn't touch the contact -- there's a diaphragm of some kind inside. Link to comment Share on other sites More sharing options...
Eagle Posted June 14, 2020 Share Posted June 14, 2020 52 minutes ago, AMC86Kid said: ok than i will just go buy a new sensor https://www.oreillyauto.com/detail/b/standard-ignition-5753/lighting---electrical-16777/sensors-16480/engine-sensors-25049/oil-pressure-sensor-switch-12875/9a4df8f34742/standard-ignition-1-terminal-oil-pressure-switch/ps15/5815754?q=PS15&pos=0 i will see if this operates between 0 - 88 ohms and if it does than i just gotta figure out how to connect it to the gauge The description says that's a switch, for use with a light. You don't need a switch, you need a sensor. https://www.oreillyauto.com/detail/b/standard-ignition-5753/lighting---electrical-16777/sensors-16480/engine-sensors-25049/oil-pressure-sensor-switch-12875/9a4df8f34742/standard-ignition-1-terminal-oil-pressure-switch/ps155/5815758/1986/jeep/comanche?pos=1 Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted June 14, 2020 Share Posted June 14, 2020 The description says that's a switch, for use with a light. You don't need a switch, you need a sensor. https://www.oreillyauto.com/detail/b/standard-ignition-5753/lighting---electrical-16777/sensors-16480/engine-sensors-25049/oil-pressure-sensor-switch-12875/9a4df8f34742/standard-ignition-1-terminal-oil-pressure-switch/ps155/5815758/1986/jeep/comanche?pos=1 Yep eagles correct. Sorry. I didn’t click the link to see the switch, I read the link seemed like it was going to say PS155 which is like the original gm pressure sender. Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 Oh so I need one of the big fat gauges like this Link to comment Share on other sites More sharing options...
1989commanche Posted June 14, 2020 Share Posted June 14, 2020 Link to comment Share on other sites More sharing options...
Eagle Posted June 14, 2020 Share Posted June 14, 2020 3 hours ago, AMC86Kid said: Oh so I need one of the big fat gauges like this Yes -- PS155. It says right under it that it's for use with gauge. If your engine didn't even have a sensor for the oil pressure, how do you know the original wiring doesn't work? have you located the pigtail in the harness that's supposed to attach to the sensor? The quick and dirty test of the gauge doesn't even need the sensor. With the ignition on and the pigtail disconnected, the oil pressure gauge should read 80. Touch the pigtail to a good ground and the gauge should read zero. Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 I have removed all the stock wiring in my truck since it was to messy and dirty the best thing for me was to start over with new wiring, so far I have everything wired in the gauge cluster and working but the oil gauge is the only one I haven’t finished yet Link to comment Share on other sites More sharing options...
Eagle Posted June 14, 2020 Share Posted June 14, 2020 1 minute ago, AMC86Kid said: I have removed all the stock wiring in my truck since it was to messy and dirty the best thing for me was to start over with new wiring, so far I have everything wired in the gauge cluster and working but the oil gauge is the only one I haven’t finished yet What year is your cluster out of? Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 14, 2020 Author Share Posted June 14, 2020 The cluster is the stock one that came with the truck (so whatever they had in 86) ok I got the part now I’m gonna bench test it and see if I can figure out how it’s suppose to be wired to the gauge Link to comment Share on other sites More sharing options...
AMC86Kid Posted June 15, 2020 Author Share Posted June 15, 2020 I figured it out Engine off Engine on Link to comment Share on other sites More sharing options...
Eagle Posted June 15, 2020 Share Posted June 15, 2020 The sensor isn't on the engine, so there's no pressure. How are you getting it to read 40 psi? Looking at your setup, shouldn't it be reading 0? Link to comment Share on other sites More sharing options...
jdog Posted June 15, 2020 Share Posted June 15, 2020 The sensor isn't on the engine, so there's no pressure. How are you getting it to read 40 psi? Looking at your setup, shouldn't it be reading 0? Looks like he's applying air to the sensor Link to comment Share on other sites More sharing options...
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