These gauges don't require a regulated voltage supply.
They are called balancing coil gauges.
They have two small coils that pull the needle in opposite directions. One is connected to ground and the other to the sender.
As the voltage changes the magnetic pull of each coil changes, thus cancelling out any voltage variations.
Your gauge is calibrated for a 0 - 90ohm GM sender.
The fuel pump is for a 91-95 Jeep Wrangler, so probably not compatible with the GM spec gauge.
They are called balancing coil gauges.
They have two small coils that pull the needle in opposite directions. One is connected to ground and the other to the sender.
As the voltage changes the magnetic pull of each coil changes, thus cancelling out any voltage variations.
Your gauge is calibrated for a 0 - 90ohm GM sender.
The fuel pump is for a 91-95 Jeep Wrangler, so probably not compatible with the GM spec gauge.