Quote Originally Posted by dave w View Post
The challenge I see to using a '427 PCM without a VSS is being able program which Spark / Fuel tables (Near Idle / Off Idle) for the PCM to use. I'm thinking without a VSS input, the '427 PCM will always think the vehicle speed is ZERO MPH. The '427 PCM could be programmed to switch from near idle / off idle, Spark / Fuel tables by TPS% only? I've never tried using TPS% only programming on the '427.

dave w
I've done this and is working quite well. I did it because someone elsewhere said it could not be done. That said I will never do it again to save $80 for a VSS... way to many hours tuning to work out bugs...