Thank you for the suggestion.
The engine is the 305.
The gauges are the original from 1984 and are not digital.
It does not have fuel injection and uses a THI Rochester carburetor.
The engine temp gauge does not work.
I replaced the sending unit and tested it for the correct OHM resistance, which looked promising.
Tested wires from the sending unit to gauge, and good connection.
Had gauge serviced and working correctly.
There are 12 volts at the gauge whenever the...