Digital Gauge Question??

[Yedi]

I have digital gauges in my a-pillar ( volts, water, and oil pressure) Thye all work fine except for my temp gauge. When I have my stereo up, turn on the wipers, or headlights the tempo goes up 6-10 degrees. I know this is hardly anything and doesnt affect anything but just wondering if it's a bad ground or what......

 

[Black Car]

It is either a bad ground or the circuit that is powering the gauge is having the voltage reduced when you turn on the other accessories.
Try feeding the power for the gauge directly from a battery source as a test & then turn everything on. That way you will be able to see if it was the power feed.

Gary