msd 8910 tach adaptor with mp dist

What kind of tach are you using to need that adapter? All of our stuff has 6ALs in them with with distributors ranging from the pro billet to stock mopar and I converted all of them to the msd plug for the distributor just in case I needed to take one from one car to make another run in a hurry it'd be plug and play with no screwing around(like between rounds) We use a monster tach of one model or another in all our junk and dont use a tach adapter of any kind, or are you using a stock tach?
Jr.