In response to Carl – trigger wheel size, refer to a prior post I did on this: 3.8 Mk2 EDIS conversion running on stand
If I were to do it again I would go slightly larger as the room exists and would make fitting the sensor a bit easier.
Regarding vacuum – I’m using the vacuum line for the brake booster and a map that came from Ray Livingston (which was posted somewhere). I blocked the vacuum port on my HD8 and used manifold vacuum based on the same reasoning as Theo…it’s what is generally posted in online support documents. Engine is still on the test stand, so no real-world driving experience yet.