OverlandMJ Posted February 26, 2012 Share Posted February 26, 2012 My 88 MJ had guages but no tach. So i grabbed a cluster out of a 89 XJ and swapped it in. Everything works but the tach isnt. Am i missing something? Also, The temp guage rises when the key is turned but when the the truck starts it goes all the way down... sensor? Gary Link to comment Share on other sites More sharing options...
chastings Posted February 27, 2012 Share Posted February 27, 2012 I did this swap a couple weeks ago... Once I plugged in the new cluster I turned the jeep on prior to pushing it back in to the dash. My tach didn't work at first either. I had to re-seat the connector one additional time and the tach has been working great ever since. Link to comment Share on other sites More sharing options...
Dadinator Posted February 27, 2012 Share Posted February 27, 2012 Tach may be defective. Mine worked fine when I switched it over. You need to change out the oil pressure sending unit by the distributor and the temperature sensor at the back of the head for those gauges to work properly. The sending units on there now are for idiot lights, not gauges. Check my build thread in my sig as I did this and I'm pretty sure I have pictures of the sending units and their locations. Link to comment Share on other sites More sharing options...
Eagle Posted February 27, 2012 Share Posted February 27, 2012 You need to change out the oil pressure sending unit by the distributor and the temperature sensor at the back of the head for those gauges to work properly. The sending units on there now are for idiot lights, not gauges. He stated that his truck has gauges. There is no need to change senders. Link to comment Share on other sites More sharing options...
OverlandMJ Posted February 27, 2012 Author Share Posted February 27, 2012 Correct Eagle, I have the cluster pushed back in place but not screwed in. I will try the connection and see if its that. If not, gonna get another cluster. Thanks for the input fellas! Link to comment Share on other sites More sharing options...
OverlandMJ Posted February 27, 2012 Author Share Posted February 27, 2012 Today I messed with the connection, got the tach to work. However, once the dash lights come on the reading on the guages drop all the way down and the turn signal and highbeam lights are illuminated. I plugged the old cluster in and it was fine. I'm gonna look for another cluster. Although it was fine yesterday except for the tach, my thoughts are there is a bad connection on this cluster. Thanks for all the input guys. Gary Link to comment Share on other sites More sharing options...
Dadinator Posted February 28, 2012 Share Posted February 28, 2012 You need to change out the oil pressure sending unit by the distributor and the temperature sensor at the back of the head for those gauges to work properly. The sending units on there now are for idiot lights, not gauges. He stated that his truck has gauges. There is no need to change senders. Missed that... Sorry. :doh: I would like to see a pic. The only clusters I've seen are the full gauges with tach and the one with only fuel and speedo and idiot lights. New one on me :huh???: Link to comment Share on other sites More sharing options...
OverlandMJ Posted February 28, 2012 Author Share Posted February 28, 2012 apparently the cluster i have is not near as common as the idiot light clusters. I will post a up a pic (if i can figure out how to.) Link to comment Share on other sites More sharing options...
mvusse Posted February 28, 2012 Share Posted February 28, 2012 Renix era is not uncommon to have full gauges except tach. Link to comment Share on other sites More sharing options...
Eagle Posted February 28, 2012 Share Posted February 28, 2012 Renix era is not uncommon to have full gauges except tach. Correct. Both the Pioneer and Chief trim levels included gauges, but the tachometer was an extra-cost option. The gas gauge was a biggie that occupied the space where we expect to see a tachometer. Link to comment Share on other sites More sharing options...
Fezzik Posted February 28, 2012 Share Posted February 28, 2012 I have one that I took out of my truck to put in a tach, pictures are at the top of my post Here Link to comment Share on other sites More sharing options...
mvusse Posted February 28, 2012 Share Posted February 28, 2012 My Pioneer came with one also, but I sold it to a member. Then the Purple People Eater had one for a few months before I found an 87 one (blue lettering) with an adjustable tach. Link to comment Share on other sites More sharing options...
Dadinator Posted February 29, 2012 Share Posted February 29, 2012 Saw the picture in your post, thanks. Never seen that one before. Of course, 95% of my experience with MJ's is with mine. Link to comment Share on other sites More sharing options...
aaronbtxnc Posted August 7, 2012 Share Posted August 7, 2012 So in what year XJs or MJs are these clusters with real guages found? I want rid of the idiot lights too. Link to comment Share on other sites More sharing options...
mvusse Posted August 7, 2012 Share Posted August 7, 2012 They were available in any year, but you need to get one similar year to your vehicle for it to work correctly. Link to comment Share on other sites More sharing options...
Harley Posted August 7, 2012 Share Posted August 7, 2012 Mine has the full gauges too minus the tach. Link to comment Share on other sites More sharing options...
aaronbtxnc Posted August 8, 2012 Share Posted August 8, 2012 Assuming to do this I will need the sensors off the engine from the donor as well as the cluster in going from idiot lights to full guages. Also assuming I will have to find a donor with the same engine for this to work properly. Are these assumptions correct, and if so where are the sensors located? Mine is a 4wd 88 Pioneer 5 spd w. 4.0. Link to comment Share on other sites More sharing options...
mvusse Posted August 8, 2012 Share Posted August 8, 2012 The sensors are the same between similar years 2.5 and 4.0. They are also available new from auto parts stores for less than $20. Don't know if there's a difference between Renix/Chrysler (HO). You need the oil pressure one, which is located more or less next to the oil filter as well as the coolant temp one which is at the driver side rear corner of the head, next to the valve cover (has a single wire going to it). Fuel gauge obviously won't need a new one and volt meter is driven directly by supplied power. Tachometer signal is also always supplied to the cluster whether the cluster has a tachometer or not, so nothing extra is needed for that. Link to comment Share on other sites More sharing options...
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