How you doing? Got a problem with my 6cyl xe ute. Fuel and Temp gauges go all over the place when my lights are on. The only time they read correctly is when the engine is at high revs. I have put a new battery and new alternator in but problem still persists. All wiring LOOKS ok. Any help would be great.

Very likely an earth problem.

Try running temporary grond wires from lights, gauges, battery to see if it pin points the problem

Could be a bugger to track down...

Thanks mate I'll check it out tonight