Gas Tank(s) Question

[redvettemike]

We are working on a '77 and are about ready to start reassembly. This vehicle has two gas tanks. We had them vatted and we painted and have new sending units for both. We have the original manual valve that lets you switch from one tank to the other. The question is wiring. We are buying a Painless complete harness. We have had the instrument cluster rebuilt. Will the Painless harness have the correct wiring set up to connect to both these sending units? Does the gas guage show the volume of just one tank at a time or both? Thanks for any advice on how this works.
Mike

 

[clarrance]

The painless harness should have an extra wire for the aux fuel tank to the electric switch on the dash. it will switch for each sending unit to show your fuel level. The manual valve under the drivers seat only switches your fuel lines.