Use a voltmeter or test light to see if you have 12V in the plug that connects to the dig tach.
Your wiring diagram may have the position and color code for the supply and ground wires.
If the repair shop says the dig tach is ok, then it is a pretty good chance that it lacks power or ground on your tractor. A DVOM can test the plug for both 12V supply and ground.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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