Shark Attack

Speedo, someone have a brief rundown of wiring. Speedometer and fuel gauge no work before cluster rebuild, now everything works but the speedo. the odometer does not work either. please daddy dont make me take out the cluster again... it went back in so nice this last time

Airflite40

for the speedo check the connector in the spare tire compartment. check the wiring diagrams and on of those wires is from the sensor from the speedometer. a lot of times when the speedometer doesnt work or works sometimes it is this connector.

Shark Attack

where is the sending unit?

FlyingDog

It's a little plastic disk on the back of the diff cover.

Rod Underwood

I'm in the process of tracking this down myself and just haven't had time to go the last step.. If cleaning the connectors doesn't work, you can jack the car up with the rear wheels off the ground and use a multimeter and see if the sending unit on the differential case is going from small resistance to infinite resistance as you slowly turn the rear wheel. Don't run the engine, just turn the wheel.

The connector that feeds this signal to the speedometer is the closest one toward the steering wheel on the left lower instrument panel plug.

This is where I am currently. I need to check continuity from the rear of the car to the connector.

I've had the speedometer rebuilt and tested in the instrument panel, so I know everything is good there. The problem is somewere leading to the panel - wiring between the back and the plug - bad sending unit in the transmission - I hope it is just the sending unit, but I believe mine is okay, it passed the resistance check.

Good luck and let me know how it turns out.

Rod

Shark Attack

Ok just to clearify, this is the plug located almost under the speedo and is the contact closest to the steering column... yes im dense

Rod Underwood

Yes, there are two connectors feeding signal to the instrument cluster on either side of the steering column. The one that feeds the left side of the cluster is on the left near the door and on that connector, the one nearest the steering column feeds the speedometer.

I'm equally dense, everything is a mystery the first (or seocnd) time.

Rod

Shark Attack

Hey Rod,
Your info helped fix this issue. I had super glue goo on the connection under the dash on that connector and pin you told me about..... now all my (knock Knock) instruments work!