[mke]

I’m using an electric speedometer,
1) Do I need the transmission harness?
2) Do I need the cable which connects to the transmission to the speedometer? (It’s leaking fluid)

 

[ToyoKogyo12aTurbo]

On our S/W speedo we didn't used the trans harness and we didn't use the cable. We did need the S/W sending unit Ford adaptor. Make sure you ground the sender and calibrate the speedo. Good luck

 

[Gatorac]

1. no, not really. If you don't hook up the speed sensor to the computer, you will get a code but it will not affect anything.

2. No

You will either need to run wires from the factory speed sensor to the speedometer or from a speed sensor that is compatible with your speedometer. Did your electronic speedo come with the sensor? My Autometer instructions said that it would work with the factory sender. I don't know about some of the others.

 

[Gatorac]

dangit! too slow again.

 

[Rick Williams]

If you're using Classic Instruments speedometer it should have come with a sensor and twisted pair wires. No cable needed.