Yeah, and that's why I'm lost at this point, because both my reference sensor and speed sensor test out to be good. I also have several other known-good sensors from E30's that I've tried.
I'll try making a jumper wire from the red/black wire on the ignition connector (50) to the red/black on the DME (4) and see what happens.
At the worst it'll either not start, catch fire, or explode. It won't make much difference at this point, since all I have is a comatose piece of metal that takes up space.
Maybe I've just somehow overlooked some kind of secret switch somewhere. Is there a general place people wire them in, or maybe some kind of connector (like that 14 pin connector you were making reference to) people disconnect to keep the car secure while in storage? I've already checked under the dash, the fender wells, under the hood, and in the cabin. Is there any chance people rig one up in the rear compartment?
Also, I found this group of wires under the edge of my carpet in the driver's foot well. Any ideas what that stray yellow wire should go to? There's been a cellular phone installed years ago in the car, and I'm suspecting that it has something to do with the factory phone wiring being tapped into.
Thanks again for all the help. I really appreciate it. The reason I'm in this predicament is because I took the previous owner's word on the fuel pump being the only issue with the car. I realized, after a very cold winter of waiting to tinker with it, that was only part of the problem.
Also, I just thought I'd mention that I know the timing belt isn't broken and the camshaft is rotating. I've watched it turn when having the engine cranked.