Gauge Cluster Issue

[MyLittlePony]

My gauges typically read, "O" for Temperature, "A" for Oil Pressure. Well tonight it seems that I have really high pressure (on the line) and very hot temperature, but only if my lights are turned on. If I turn off my lights, everything falls back to normal. If I just have my parking lamps on, the results are the same if the headlights or brights were on, same if fogs are on or off. When the car is not running the same result. High oil pressure/heat with the lights on, fine when their off. Im guessing its whenever the needles are lit.

What is their malfunction?

[DESERTCOX05]

look at the headlight sw harness for a melted connector.  common prob for the sn95's.
also look at all your batt cables under the hood for loose or corroded cables.

[slo1]

Mine had the same problem when I bought it and I bought a cluster from a bone yard and
it fixed my problem I guess it had an internal short.