Okay I am contemplating putting my SM465/205 in my 90 Blazer, and the only issue I have is with the electric speedometer since my 205 is old school and dosn't have a toner ring. I was thinking that I could just swap in a old style cable speedometer but I don't want to piss off the ECM. So how much does the ECM care about knowing the speed of the Blazer? If im swapping in my sm465 then I wont be using cruise control so that dosnt matter. Will it throw a code or anything or is the VSS used only to run the electric speedo and cruise control? Is there a kit out there that I havnt seen to adapt a VSS to a np205?