Wiring in a volts gauge.

Badsport said

The diagram shows the black going to the starter relay, is that the original and I am adding a second wire?

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i located both the red and black that go into the bulkhead inside the car, cut them off, and soldered and heat shrank new wires and ran them both through the firewall to the starter relay just like its shown in the diagram. this after i connected the ammeter wires together. the red and black are wired to a new fusible link, then to the relay.