I know some poeple fab up a manual reverse light switch, on a bracket for the 6l90e. But what about the 8l90e? I know there is a company selling a can based module for 220.00 and two relays for park neutral and reverse. That's way over priced for what it is. Besides I want all the range switch signals to light up my cluster for prnd321 then. So why can't we just somehow mount or adapt a 4l60e range switch?
And he can baised module is stupid to include the park neutral signal, when both the 6speed and 8 speed autos include a ground signal when in park or neutral. I'd pay 100 for just a reverse light relay working of can bus without the park signal.