I have an MS3 Pro PNP, NB1 motor, NB2 chassis. I'm trying to add a Bosch 2 wire knock sensor. The rear options connector on https://www.megasquirtpnp.com/docs/mspnp_gP_mm0105.php says Pin B is knock sensor 2. This makes me think that the knock sensor on the 01-05 wiring/ECU can reuse the stock wiring that is already there. I haven't had an NB2 motor for a while and I still have a loose connector in there. Before I wiring something up to it only to find out I fried my MS3, can I reuse the stock wiring on the Bosch module or should I find a 12v sources and run my own wire to Port B? I would much rather reuse stock wiring if I can.

 

Knock sensor should be an input, and a sensor ground. It generates it's own voltage. You can simple wire the Bosch to the factory 2 pin connector. Luckily there's a fairly long pigtail on the NB sensor, I like to cut this off flush with the stock sensor, add the 2 pin Bosch connector, and voila, you've got a little pigtail that's still secured by the bracket on the timing cover.