I have a 49 chevy P/U that I am putting new wiring harness in. I have everything in the cab wired up. Now I don't know how the wiring runs to the back of the truck. I know that the gas gauge wiring goes to the tank from under the door area. I have the rubber gromets in the rear installed. How does the wiring go from the firewall to the inside of the frame?

Thanks

Bennie