You might check with Rhode Island Wire Service. I have used them for wiring for my 41 DeSoto. They can make the harness or they can provide the proper wire and terminations to do any wiring job. There is another service called YnZ Yesterdays Parts that also provides the same type of service. www.riwire.com www.ynzyesterdaysparts.com Making a harness yourself can be done but it is a lot of work depending on the complexity and size of the harness. To do it right you will need the old harness and it will need to be laid out on a harness board using harness board nails to guide and set the shape of the harness. Document the wire branches and terminations and list the appropriate wire gage, color and termination for each wire. Good luck Gene