I live in Orlando. Where are you? I am converting my 75 914-4 2.0 to a 2.2 Six. Jim Patrick of Patrick Motorsports just completed an engine wiring harness for my car. They can assist you with a harness.
Patrick Motorsports - Custom Porsche racing parts and services. In fact I think this is the engine wiring harness you might need...click on this link.
Patrick Motorsports - PMP 369144CH