I executed my installation in three steps, on three weekends.

The first step was to install the lock motor and test it, making sure the linkage was engaged as not to pop off motor operation, manual operation, or door closing. I used the +12 and GND lines from an Apple II power supply to test.

Then I installed the electronics -- the receiver, my interface board, and the relay in the door, minimally so it would only work the lock.

The third step was to take my dash apart and get things like the park flash, and courteousy lights. I decided a horn honk was not only personally annoying, but not worth the bang for the buck.
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89 764 GLE 150k/ 86 745 GLE 240k