Autoshift to 18Speed manual

[DVT873]

Don't know for sure on a KW but on a NAV the speedo signal is going to go from the trans TCU to the ECM over the datalink. Back-up switch could be hard-wired. Was there a switch on the Ultrashift whose wiring did not go to the trans-TCU? Or it could also be going out the datalink. The TCU will know when it is in reverse. Same with the neutral safety switch.

I know guys do this but I don't know how they get it all to work. I assume the engine would want to see road speed. And it might not like not seeing neutral.