OK, just got back from a cruise in.
The msd unit is a 6AL , the distributor is a msd pro billet small diameter street ford, and the coil is msd blaster.
I have the tach hooked to the tach output on the msd unit.

Denny, also noticed that when I turned my heater on the tach started to drop. The power is definately being pulled away from the tach, the good news is that the car runs great.

I did notice today that this battery that I have in the car seems like its lacking power, when the cars running if you have lights and the heater on the power windows go up really slow. The car is charging.
Could the battery being weak be causing this problem?????

Rocky