All the part-numbers discussed below can be seen on this page: http://www.westach.com/products/ACCESSORIES/SPEED%20SENSORS/index.php
My EFIS system came with this unit for a tach pickup: 303DGT It fits a Lycoming tach output, not the one on the VW. I am thinking of getting this unit: 720-14R, since my motor has a slick mag on it - I assume that this will screw into the back of the mag & pick up RPM by detecting the mag parts as they spin past it... Is this right? Also, is there any way to make a Lycoming tach pickup fit a VW motor (so I can avoid buying a whole new tach pickup)?
