I just did this mod tonght. I put the canibalized door opener under the instument panel and mounted the same switch shown in the picture.
I wouldn't do this mod for any money for someone else since it was the most irritating thing with setting off the opener too many times and the tiny wires and soldering with the equivalent of a cold tire iron and enlarging the hole for the switch.
But, it's done, looks good and works like it should but I just realized that I will have to go back in there when that ****** battery runs low. I have the opener wedged behind the tach and between the idiot lights and it just fits.