The Mustang bulkhead connector picture brings up a good point...make
sure the connector is sealed well. Otherwise, the contacts will corrode and
you will be chasing electrical gremlins forever. Also, make sure the
cable end is secured somehow....the Mustang connector is retained by the rubber
jacket being a tight fit around the mating jacket.

If the connector you find does not have a retaining method, make a sheet metal
finger that holds the connector in place and secure the finger with a screw into
the firewall.

mike in tucson