Rogers optical setup uses 4 pickups i believe...i'll have to count the cutouts on the VW sensor plate (on crank) to see how many it has. Would be cool if i could use it that way!
Read the 4 crawler link and a lot of it seems hypothetical. Maybe his 4 pulse application worked but every 4 cylinder single coil motor I've ever worked on had 2 pulses per rev...Oh no. I've just sussed it... probably should have read the text it may have been explained.He was taking a signal from the injection pump and the injection pump runs at half engine speed hence doubling the pulses!Let me know the TDI setup.Johnny,If you can photograph the other side of the board I may be able to help but I doubt it very much - it has the wrong chip.