A young and flexible back/body is what you need for wiring behind the dash.
I don't have a problem doing electrical wiring but it's misery for me to contort my body to fit.
If I get stuck, the wife has to come and pull me out by the ankles.
The other thing to watch out for is that most (not 100% positive) of the 12 volt harness kits are designed for typical hot rod cruiser (my words here) conversions with all the bell and whistles. The package might say "for 1947 to 1955 Chevrolet trucks" but that doesn't mean it will work perfect for you. Companies make kits with the desired options that sell the most.
One example. The kit may only come with one plug to wire up to a typical replacement modern GM steering column with cruise control, turn-signals...brake, horn, e-flashers etc. Why? Because this is today's current popular item to have installed on old trucks. To me it's madness. If you want to keep your stock steering column, you have to make your own adapter/connector for existing horn and turn-signal device. It can quickly become confusing to you. If you are committed to doing the wiring , you definitely need to do your homework. Once you strip out the old wiring and begin installation, not many on this forum will be willing to help if you get stuck with a bad problem. It's not that we don't care, it's that we expect you to educate yourself about the electrical system and wiring techniques so that problems can be discussed intelligently.
