I've done the search on how to adjust the electric speedo, but all that was mentioned was a calibrator. So I found the one made by "Superlift" and the one called "Little Yellow Box", but they all want $100 to $200 for it! I only need to adjust this ONCE! I'm changing the gear ratio in my Father's `94 3/4 ton VAN and want to correct his Speedo so the Vss doesn't crew up the tranny and ECM! Are there any other option out there!???? CHEAPER &/or EASIER! Thanks in advance!