Solved problem with VEMS sporadically not starting properly and not powering the fuel pump (described below). The ignition Lock switch was bad, so no VEMS problem at all. Seems a weak point on all Audis.

Discovered it because the fan kept running with the key in the OFF position.

Oh, and somone created a root folder with my name for spamming, nothing to do with me.

Hi Vasilis, sorry about the late reply. Been busy working. The brittle bit was in the car wiring. There is a red and a purple signal wire and a black GND wire. The GND wire was bad the whole length from the screening to the plug on the car side. This problem was in the trigger sensor for the crank (Primary trigger).

For the speed sensor, I soldered an extra wire onto the sensor on the gearbox. It has only 2 pins, and I am pretty sure I used the "centre" one (the plug has room for 3 pins, although only 2 are used). This wire then goes directly to the speed input on the VEMS. The VEMS end is actually only wound toghether and taped, and it still isn't too noisy.

If you grab the signal at the radio, I don't think that it is a pulse signal any longer, but a voltage signal (not sure). You should grab the signal at the gearbox or behind the tachometer. Also, make sure your wires are well away from the ignition coil. I pulled the speed wire in through the firewall next to the brake hydraulics and routed it to VEMS (original location in the passenger footwell) inside the car. I also untangled the trigger wire and attached it to the brace between the shocks. There are lots og high-voltage wires next to it if you run with a distributor, and a bit of distance to those is no bad idea, I think ... oh, and I use FW 1.1.95