No need to be a smartass. Not going in something that had a tach before. That one requires modifications to the balancer or flywheel. Not looking to make the plate it requires to do it unless its my last option. I know there has to be better ones out there.
Design Technology, Inc., Home of Tiny-Tach - The Tiny-Tach Line of Tachometers
I had one of these on my first gen. Worked well and no machining required.
I'm sure you could get what ya need here:
Destroked - THE Cummins Conversion Company : Tachometer Kits