I've swapped in a TBI engine in my Blazer and got a painless wiring kit to hook it all up. It states that for the engine to run efficiently I need to hook up a VSS. The truck has a 78' SM465 and a NP205, which to say it doesn't have a hook up for the sensor. Any companies out there that sell a unit that you can hook up the speedo and the VSS into the same port. I have also heard that a company makes a new speedometer that you are able to hook up the VSS into it. Anyone have any idea's??? Any info??