Carb choice for a mutt motor.

here's how the gages and sender work.
Thermal-Electric Gauges (Session 227) from the Master Technician's Service Conference

And there's the filmstrip that goes with that.


If the temperature and fuel gages are working then its downstream of the IVR.
Could be a connection on the board or anywhere to and including the sender.
Hopefully the sender is OK. replacements aren't calibrated correctly for the gage on your 67.