Good idea on the ground,

What you might be able to do is add a ground to the"gauge cluster" (mounting screws). I've never tried it but it might be possible without removing the instrument cluster. Remove the plastic panel above your knees, and have a look.

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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"