The squirrely gauges are almost always a ground problem. Newell chose to daisy chain the ground on the instrument gauges. If you look into your panel it is evident.
Saves wire, but leads to this kind of problem.
Solution, do as Tom has done and run individual ground wires to the gauges. Or, live with squirrely readings from time to time.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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