ok here is my problem. i have a 85 k5 with a 90 engine in it. the PO rewired the whole truck with the 90 wiring. i have a 79 transfer case with cable drivin workings. so i would need a a older speed which i have out of a 79, dont work cause of 90 wiring. i have 90 guages , everythign works but speedo. is there a device that converts the vss where i can hook up a cable to get the speedo to work with my 79 drivetrain? i know there is but i dont know where to look and i have seen some for 200 bucks but i have heard there is also some for like 50. can anyone help?