Only one thing I would add to the ground issue. Taking the ground strap off (engine to body, left side) and cleaning the contact area wouldn't hurt. I once forgot to hook it up before starting to wire up the radio, All kinks of strange things happen when the ignition switch is turned on. Anyway I would make sure there is a good connection there. (13mm bolt I think)
Didnt he say that the needle stayed in one place for some time?.. but wouldnt a lose or bad ground make the needle jump? Doesn't seem it would stay still...Or would it 
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug
"Lifes too short to drive a boring car"
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