putting an OBD2 engine (5VZ ) in an 86 pickup.
I'm using a 5 spd ECM. The ECM needs an electronic speedo sensor input to keep the check engine light off, but in order for my speedo to work, it needs a cable.
Is there a splitter that exists (like for the old GMs) that screws into the trans and has 2 locations for outputs (one for the cable and one for the VSS) or will I have to find a reluctor wheel and mag pickup to put on the T-case output for the VSS signal?
I can't imagine everyone who has done this swap driving around with no speedometer....how do you do it?
EDIT:...just did a bit more research. Alldata says there is a reluctor wheel (rotor) that peaks 4 times per rotor revolution and feeds this signal "waveform shaping circuit" in the speedo head to clean up the signal into a more precise squarewave form, then into the ECM.
VSS #1 is in the T-case. Its hard to tell from the pictures, but it looks like the 4 tooth rotor is pressed onto the T-case output shaft inside the housing, and looks like a mag pickup...but every VSS I've seen has a gear on the end...which would indicate that the rotor in question is inside the sensor. Basically, I'm trying to figure out if I need to have 4 squarewave peaks per output shaft revolution or 4 squarewave peaks per VSS shaft revolution (gear driven VSS). I'm thinking it wouldn't be too hard to make an external reluctor wheel and use an ABS sensor as a pickup...they output a nice squarewave, so I'd be able to run that to feed the ECM and keep my stock cable for the speedometer. Thoughts?
