Has anyone tried to take a working tach that came off a 4 cyl eagle, and adjusted it to work on a 6 cyl eagle?
It has a piece of tape on the back of the tach, and a hole to adjust it.
Has this ever been tried? Fail or success?
I've got a NOS gauge from a guy here, and the tach is stamped for a 4 cyl. I got the 258. So I want to know if I put a second tach on the car, and turned the pot on the back of that tach, could it be adjusted?
As I understand it, it's possible but I don't know for sure. It plausible that there's only one tach for all those engines AMC used, and the common tach is just adjusted for either the 4 or 6 cyl engines.
Any comments, or know-how?
I have looked it up in the MR251.
Tachometermeter calibration values for 4 and 6 cyl engines are on page C92.
It is done with a square wave generator.
On page C99, it is saying that it can be tested, but can not be adjusted.
It doesn't show a pot or anything.