When I had problems with my garage door opener (and my windshield isn't at risk!) I was able to find installation/operating pdf manuals by brand/model searching on the web, and that helped a lot.
Those limit switches are the important key.......
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.