If i got a universal wiring harness from ebay would that work fine in my 66 mustang??????
If so then how many circuits do i need to look for?

 

Sure it would work. It would be no different than wiring up a street rod. It would just be a lot of work*S*

I'd probably get a 15 circuit setup.

 

I think most aftermarket require dealing with ends and so forth so I don't see why a universal wouldn't work as well. Ron Francis is pretty inexpensive or you could spend a bit more and go painless. I got the Ron Francis and am starting into it now - I wish the ends and feed to the engine compartment would have had the stock type connectors (what to do then with the hole no longer being used........

 

rubber filler gasket thing?

i got the painless and honestly with painless, your just buying better wires, all labeled and bunched together so its easier to find what goes where, everything else is a PITA

 

So with the new harneses either painless or Ron francis they all will hook up to your old conection plugs like steering pigtail and ignition pigtial ect...?

 

green basicly yes you just have to put the wire conectors on the ends of the wires tho.they also make a oem replace one with the conectors on it but ita skinnier wires then painless and ron francis uses.