OK ive got an hour or so before i have to go to work so i decided to have a look at this tach setup, the 22 sensor i have used is obviously working as i get numbers on the display but they are all over the place, so i decided to investigate the existing sensor that is on the spindle, this is an rs 306-061, there are two types of this sensor, mine is the slotted type, my uestion is can i use this with the divider circuit i got from irving...(posted earlier in this thread??) or indeed if irving is around what does he think..

Rick