my 86 735i speedometer does not work, and just cant figure out how to get back there to figure it out. its getting really old getting all those speeding tickets..anyone have any ideas? anything would help
thanx
william

On the aft face of the differential is the speed sensor.

There is a rubber boot over the connector.

The splashed water still gets in and causes failures.

Clean the connector and use some petroleum based grease to seal it.

Install the rubber boot and you should be good for 10 years.

Later,

On the aft face of the differential is the speed sensor.

There is a rubber boot over the connector.

The splashed water still gets in and causes failures.

Clean the connector and use some petroleum based grease to seal it.

Install the rubber boot and you should be good for 10 years.

Later,
thanx a bunch ron,really hope thats all it is
will

In my 85 735i the Si board shorted out. You can check yours by removing the steering wheel. Then there are 3 screws at the top of the cluster under the dash right in front of the plastic. then just tilt it forward and out to check for loose connections and look for burnt electrodes. you can find a replacement at a junkyard for about 20 bucks. I replaced my entire cluster from a 1983 733i. check out http://e38.org/e23/ for more info.