Since I installed my OHC, I've noticed that the temperature updating has been hit-and-miss. Sometimes it will rise with air temperature, most of the time it won't. Recently, I bought a Ford H/U with speed volume. Spliced that into the VSS wire, made sure the connection was good, and found that speed volume isn't working. I read somewhere that Ford changed the VSS scheme between 1997 and 1998, and that parts from the two "eras" aren't compatible (eg: OHC from 1998+ won't read the VSS in a 1997 truck). Can any electrical gurus here confirm that this is true? Perhaps the gray/black wire behind my radio is in fact NOT VSS after all?
2004 Ranger EDGE, V6 SOHC, 5 speed | Mods: Explorer OHC, Turn Signal Mod