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now, now, no mentally disturbing imagery here........

On the hmmwv I think it is all good, direct mechanical drive. Not sure on the M939, I know the A1 & A2 use a different 90* adapter on the cable due to the tire size to make the ratio correct but the speedo is the same unit. Should work ok as long as the correct tire size matches the ratio of the...

Thinking of replacing my stock mechanical speedo since mine does 69/70. I know they have the electronic 80mph in the later models. My thought was to use an aftermarket like this autometer #2690 since it mechanical and change the bulb to 24v . Anyone gone this route?