88whitebandit Posted February 13, 2012 Share Posted February 13, 2012 What's up guys I have a 1988 white 2.5 4cyl 4x4 Comanche and Ive got a few questions about the switch from the big gas gauge cluster to the rpm gauge cluster... I've seen it on a few Cherokees at the junkyard and wondered if I were to switch the clusters what would I have to do to have the rpm gauge to work....would I have to set up a new wiring to it? Or does the original wire connectors be connected to the instrument gauge work? Any helP would help tremendously!!!! Thanks guys!!!!! :help: :wrench: :cheers: Link to comment Share on other sites More sharing options...
smuth Posted February 13, 2012 Share Posted February 13, 2012 You need the gauge cluster off an 86-90 MJ or XJ. You'll also need a oil pressure sensor (not the dummy light one) and a coolant temp sensor. Your Tach will work just fine. Link to comment Share on other sites More sharing options...
88whitebandit Posted February 13, 2012 Author Share Posted February 13, 2012 Ok awesome...ok since you said about the coolant temp sensor an the oil pressure sensor...how would I have to add the coolant temp and the oil pressure sensor? I know by buying the sensors needed but do they need rewiring? and for the computer to be adjusted to learn to what temp or pressure needed? Or the computer has already learned the specs needed and just née them wired to the cluster? Sorry for asking so much I want as mug detail as possibly can to do it right the first time. Link to comment Share on other sites More sharing options...
Harley Posted February 13, 2012 Share Posted February 13, 2012 Correct me if I'm wrong but don't ya need a cluster from a 4cyl for the tach to work right?? Otherwise I've seen a few threads about adjusting the tach so you can use a 6cyl cluster in a 4cyl. Link to comment Share on other sites More sharing options...
Blue88Comanche Posted February 13, 2012 Share Posted February 13, 2012 Correct me if I'm wrong but don't ya need a cluster from a 4cyl for the tach to work right?? Otherwise I've seen a few threads about adjusting the tach so you can use a 6cyl cluster in a 4cyl. if you want it to be plug and play yes. but you can get one from a 6 cyl. if you dismantle the cluster and look on the tach there will be a little calibration nob with slot for a screwdriver... that is how you can adjust it. however getting it adjusted is up to you. Link to comment Share on other sites More sharing options...
Jeepman Posted February 13, 2012 Share Posted February 13, 2012 There is ABSOLUTELY no wiring changes needed as it is 100% plug and play installation for the sensors and the cluster itself but as said for the tach to be 100% correct a 4 Cyl Tach would be needed otherwise a calibration is in order.. Link to comment Share on other sites More sharing options...
vaquaro Posted February 13, 2012 Share Posted February 13, 2012 :wrench: Adjusting the tach ; remove the clear plastic , remove the speedo to gain access to the adjuster pot screw on backside of tach , use a handheld tach for reference , turn screw to match RPM 's while running . Re-assemble and your done :thumbsup: Link to comment Share on other sites More sharing options...
mvusse Posted February 13, 2012 Share Posted February 13, 2012 If your current cluster has dummy lights you need to swap the oil and coolant temp senders for the new gauges to work. If your current cluster has gauges, the current ones will work just fine. Link to comment Share on other sites More sharing options...
88whitebandit Posted February 13, 2012 Author Share Posted February 13, 2012 Ok thank guys...I'm pretty sure mine has the dummy lights but all I have to do is swap the sensors to the tach right? Just to be sure.... Thanks and I also have a friend that has an 89 4cyl 4x4 as well that's interested to swapping to the rpm tach a well...after reading this well both will be doing the project together I wish I had pics but I've gone rebel on the smartphones and digital cameras that I haven't got pics of my comanche when I first started Link to comment Share on other sites More sharing options...
Blue88Comanche Posted February 13, 2012 Share Posted February 13, 2012 I'm pretty sure mine has the dummy lights but all I have to do is swap the sensors to the tach right? the tach is plug and play. its the oil and coolant sensors that need to be changed Link to comment Share on other sites More sharing options...
88whitebandit Posted February 13, 2012 Author Share Posted February 13, 2012 :bowdown: :wrench: Awesome thanks guys appreciate it very much Link to comment Share on other sites More sharing options...
Harley Posted February 13, 2012 Share Posted February 13, 2012 Theres no "sensor" to swap for the tach. Its plug and play ONLY if its from another 4cyl. Otherwise you'll have to mess with it to get it set correctly Link to comment Share on other sites More sharing options...
Eagle Posted February 14, 2012 Share Posted February 14, 2012 Correct me if I'm wrong but don't ya need a cluster from a 4cyl for the tach to work right?? Otherwise I've seen a few threads about adjusting the tach so you can use a 6cyl cluster in a 4cyl. if you want it to be plug and play yes. but you can get one from a 6 cyl. if you dismantle the cluster and look on the tach there will be a little calibration nob with slot for a screwdriver... that is how you can adjust it. however getting it adjusted is up to you. However, the '84 thru '86 XJ tachometers do NOT have the adjustment, and '87 seems to have been a transition year on that. Also, the speedometer heads were different and the 84 - 86 (or 87?) will not work with the '88 speedometer cable. For an '88, you really need a cluster out of an 88 thru 90 XJ (or MJ). Link to comment Share on other sites More sharing options...
88whitebandit Posted February 15, 2012 Author Share Posted February 15, 2012 What would be considered as a sender? Link to comment Share on other sites More sharing options...
vaquaro Posted February 16, 2012 Share Posted February 16, 2012 NOPE....Read the replies A: 88-90 cluster for correct speedo connection B : Temp. & Oil sensors need to be replaced C: Adjust the tach as previously advised :thwak: Link to comment Share on other sites More sharing options...
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