72 duster firewall wiring questions ???

Sigh of relief! I have 12 volts on the brown wire!!! I completed the Mad Mod and ran a 14 gauge blue wire through the bulkhead while I was at it. Had to untape the looms while wire tracing and soldering / splicing under the hood and a little in the car. I also added a signal wire off the keyed 12 volts to actuate my new relay for the autometer dash. Once I get things a bit more tidied up I will put up a conversion thread. Thank you guys for the advice and the wisdom! So much more to learn about these Mopars, one thing at a time. Feel like I owe you guys a beer at least!