Do you have an aftermarket tach? Or the stock one with whatever set up is needed to work with MSD?
I'm not certain the Sun timing light with tach would be so accurate, is it new or old? Some "trick" timing lights don't work well with MSD type ignitions. But it could very well be reading correctly.
Hopefully you'll be set with Rick's stuff.
tach is from charger specialties. made sure it was set up for msd, and he said it is. can only go by that.
the sun tach was from the shop where i dyno'd the engine. he has an msd box on his dyno, he knows his stuff.
