[Formulajones]

I have an msd box that shows the limit on the factory tach. It's just a digital 6 that has rev limit and capacitive discharge, and I trigger it with the stock points distributor.

I don't have to do anything fancy with ground wires, just turn the knob to your rev limit and it shows on the tach every time I turn the key on.

I had an msd module in an hei distributor once that did what you described and that worked fine. Sounds like maybe a faulty msd rtr distributor??