Good info, thanks! This e-article mentions adding a door lock actuator... I would recommend, however interfacing with the vacuum locks by cutting the green with blue stripe wire (inside drivers door, at the vacuum actuator) and using 2 relays as shown here:
http://www.the12volt.com/doorlocks/page3.asp#vac

Regards,

- Jeremy

1990 V8Q Zyclam Portland, Oregon (USA) http://www.MyV8Q.com/ Fun, Fun, Fun auf der Autobahn