benjy_26 Posted May 16, 2019 Share Posted May 16, 2019 Hello all. I recently installed a full dash cluster in my '87 Sportruck. The cluster I obtained came out of a '88 XJ with a 4.0, so the tach is off (by 33%, I think). Now, I know that the proper way to adjust a tach is to install a reference tach, start the engine, and adjust the on board tach to match the reference. What I was wondering is this: since Jeep only used a 4 and a 6 cyl engine in these vehicles, would turning the adjustment knob all the way over to the opposite end of the adjustment range get me the correct readings, or should I just do it the proper way? Thanks in advance! Link to comment Share on other sites More sharing options...
eaglescout526 Posted May 16, 2019 Share Posted May 16, 2019 I did this with my blue cluster. I turned the pot dial all the way to the left for four cylinder after installing it and fiddling with it to see where the right RPM was. I thought I would’ve needed a reference tach at first but after I got my REM the tach was correct to what the REM was saying. + or - 100 RPM. All the way to the right is for 8 cylinders. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 16, 2019 Author Share Posted May 16, 2019 Cool! Thanks! Link to comment Share on other sites More sharing options...
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