Contact 'Fester', he has a microtach in his s12 and has the tacho hooked up and working I think. He is quite good on electronics and the microtech, from memory there is some trick to getting the s12 tach to read accurately with a microtech that he knows, (use the member search facility to find his profile so you can pm him)
/me shakes head sadly at poor gerry...
As it happens my tacho isn't hooked up (it was with the old Digi, but not the MT8), but that's mostly because I'm a lazy bum. There's a bunch of other electrical stuff that's died or is on the way out, but I'm too damn lazy to fix that as well. I should take a couple of days off work and pull her apart a bit I suppose, but its so hard to find care factor
I'm thinking about making the trip up in 1-2 weekends kingos, I'll let you know. Always good to see another gazelle