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So tonight i got around to installing my full cluster on my 86 mj with the 2.8. Almost everything works beautifully. With the exception of the temp gauge because i havent swapped temp switches. I think i got sold the wrong one anyway.. So my issue is that my tach works but it seems oversensative. If i turn the key to the on position the needle jumps to 0. But when i started it the needle looped all the way around past 70. Pounts almost straight down. Hooked up an aftermarlet tack, pulled the needle off my tach and set it up to where the aftermarket tach was telling me it was idling. About 700rpm. Now it kind of reads better but its still oversensative. Tap the gas peddal and get it to rev to about 1000 rpm and it will jump up to the 30-35 mark and hover there for a minute before creeping back down almost to the 700 mark. More the 10 mark and would occasionally rise on its own. Why is it doing this? Where should i start looking to fix this? Thanks all!