Posted 2/19/2021 10:07 (#8844309 - in reply to #8844207) Subject: RE: Allis Chalmers 6080 tachometer
73036
Been a while since i have done it. If you go to that web link,an then scroll to the 5th an 6th picture of the tach. It will show the back side which shows the black button to use to adjust. Next picture shows the instructions.
As i recall, i just played around with the numbers, until it read correctly, at full rpm.
Allis Chalmers 6080 tachometer
