MSD 8962 Boost Timing Master, With Vacuum Advance feature allows timing to be advanced for boost pressure from a supercharger or for nitrous etc turbo charger .
MSD 8962 Boost Timing Master, With Vacuum Advance MSD8962 Boost Timing Master, feature allows timing to be advanced for boost pressurefroma supercharger or for nitrous etc turbo charger .ie degree of timing adjustment per psi of boost !! works with 6 or 7 series ignitions