Is there any difference in the SpeedCal units sold by Dallas Mustang and Brothers Performance? Is one any better than the other? Got my 3.73's on order and I'd better figure out how to get my speedo corrected.
I have an Abbott speed calibrator on the way. I'll let you know how it works out. I know that the Brothers and Dallas Mustang Speedcal are identical units made by the same people. Does anyone know if the Abbott is made by the same company too?