Gunny65 Posted April 25 Share Posted April 25 (edited) I went out to warm the truck up (1979 DM685sx T/A Dump Truck) and noticed the tach and speedometer are not working...again. They started working for a few days and now they are not working again. No movement on either one. Suggestions on where to start my testing? I have two manuals but neither one covers gauges. If anyone can also point out where I could get a manual for the electronics end of it I would appreciate it. Thanks. Edited April 25 by Gunny65 Quote Link to comment https://www.bigmacktrucks.com/topic/74089-tach-and-speedometer-working-intermittently/ Share on other sites More sharing options...
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