Fuel gauge and temperature gauges pegging to full fuel and hot after 45 - 60 minutes.

[Hugo Habicht]

fuel read over full, temp read super hot, ie both needles go far above the 'maximum; reading.
both circuits are typical 'old school' +12 from batt to voltage regulator to high side of meters, the sensor are connected to low side of meters and ground.
if you 'short a sensor', that meter will 'peg', go far above maximum.
for BOTH meters to do this then both must have their sensors shorted at the same time.

As I said, this is a highly unlikely event to get two faults simultaneously, unless it happened one meter at a time. Original post does not say what happened. The voltage regulator being faulty is a more likely scenario.

 

[whitetiger]

As I said, this is a highly unlikely event to get two faults simultaneously, unless it happened one meter at a time. Original post does not say what happened. The voltage regulator being faulty is a more likely scenario.

Or the harness is worn through or pinched, and both wires are being grounded.

 

[Hugo Habicht]

Or the harness is worn through or pinched, and both wires are being grounded.

Please accept my apologies, also to @GreensvilleJay. I had not read the original post properly and missed that the meters failed one after the other.

So no, it is not the voltage regulator and the wires are more likely.