PCV and Speed Input & SpeedoHealer

Healtech recommend gear position indicators are placed between the sender and the healer, IE, installed before the signal has been manipulated. It would be the same for any other add ons to. I'd install it before the healer, that way the signal to the PCV is clean and untouched and you can make future alterations to the healer without disturbing any PCV data input. Hope that helps.