[TBONE1964]

Originally Posted by gonnuts

My tach is an LMC(I think) and is different than the pic above. It had a hole covered by a QC sticker, I tried a flat & Phillips screw driver neither seemed to fit. I looked up there with a mirror & it looked like a blue plastic ??? But I couldn't see a screw head. I tried taking a picture but couldn't get it to focus(I have the same problem sometimes). Anyone know if this is in fact the calibration adj. ? Attachment 1253202

I am not where I can see the ones I have in my inventory (aftermarket). Some of these may be non adjustable. You may also have a plug in there that prevents adjustment. If you need to work on it, it is best to remove the cluster from the dash to get a good look at it. You can plug the tach in out of the cluster and run it as long as you have the the tin grounded or use the center lug which is also for a ground.