If your tach is not working you can repair them by just changing out the chip in the back of the tach. It is round & has 4 prongs on it that just plugs in to the back of the tach. If you can find a tach that the face is all worn out or one that is cheap you can use the chip from one of those to repair the tach you have. I use to repair the hood tach's with the chips from the dash tachs, & it worked fine. The chips work in all the tachs, all they do is unplug from the back.
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