The guages are just a symptom of the circuit, the problem CAN be there but also any other circuit in the line including the hazard circuit, radiator fan relay etc. I would check from the fuse block out.
Link to Wiring diag from Panteraplace:
Pull the wires one at a time from that circuit on the fuseblock and check with a meter for a short. If you can't find it with a meter, replace the fuse and replace the wires one at a time until the fules blows...you just found the problem circuit. Just back trace from there.