Yes it is possible. Electricity always seeks the path of least resistance and the gauges as well as the night time driving lights in the dash all share a common ground which is the steel housing they are mounted into. (There is no ground wire in the 12 cavity plug-in.)
Please note that the ground for the night time dash lights has to go thru several copper pathways in the printed circuit first to get to the housing. The 3 gauges are wired directly to ground at the housing with the 12 volt + power supply as well as the seeker wires to each sender going thru the PC.
The 12 volt + (key on) power to the electro-magnetic coils of all 3 gauges are wired in parallel so high resistance in one gauge or one gauge's seeker wire could result in a back-feed into one or more of the other coils, that or one of the light bulb or bulbs; the filament(s) for the gauge cluster's night time driving lights.
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Peter Serio
Owner, Precision Pontiac
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