For anyone that swaps engines or transmissions in a 90-92 and needs something to convert the speedo signal (assuming ECU delete or swap to a standalone) the Dakota Di


gital SGI100BT works fairly well.

Wiring comes from the C207 and VSS.
Ignition: pink w/black stripe from C207
Cluster: Gray wire on C207 to OUT3(4K PPM signals)

Ground: I grounded it to the shifter base.

Input: Yellow wire from VSS
SPEED-: Purple wire from VSS

Settings for accuracy after initial setup and calibration while driving are in pic. 533Hz on test should move speedometer to about 35mph.
Of course the calibration will vary based on tire size (I have 265/75r15). I mounted the signal converter to the heater box for hidden, but easy enough access and because it was close to the wires I needed. I ran my VSS wires though the grommet that the shifter cable goes through.

I struggled with this for a while because of constant mixed answers and diagrams on highs and lows of signals and which of the VSS wires should be used as the ground and minimal information on if different harnesses (mine was V6, VIN T) would make a difference on the C207 connector.

Works well, but may lag or drop signal briefly, which reviews prepared me for but nothing major.

Hopefully this helps anyone looking into this product or something to calibrate speedometer to be more accurate. Tested it for 20 miles.

 

I bought one of these units when I was building my car. Didn't get the chance to use it tho, I have a 4l80e in there but when I touched a wire to the battery that apparently shouldn't have been touched every light on the gauge cluster came on and that was the end of that cluster. So I ended up buying an autometer gauge setup