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I did my 42 and 46 Fords with the dash in the car, but I think could be done either way. I'd do the dash wiring on the bench and install the dash. Then feed the light wiring thru the firewall. Wire for the solenoid needs to come thru also and maybe one other wire. I then installed the grommet. I can't remember if I split it as Alan mentioned but it worked well. The lighting wires are fairly short coming out of the firewall. Used a Dennis Carpenter harness on both cars and it was user friendly with good diagrams.