i replaced with a digital mult-retard unit when i put on nitrous, works great and was on a 96 Z28, like new had the unit checked by msd about 3 months ago, model 6a pn 6200, asking $150 obo, also have a hypertech model 30027 for 96-97 5.7l lt1, asking $125 obo, i'll will even pay the shipping in the USA.