It's quite difficult to actually see the knob from underneath.

It's dead center both ways behind the cluster, hold the bridge across the back to the dash support.

You can only get to it from underneath. Drop the parking brake bracket and unplug the large wiring harness that runs across, and you should just be able to catch a glimpse of it. Mine was white, but if yours is black, you may not be able to see it.

You will have to stick your whole arm up there to find it, it's a long reach (elbow deep).Go in on the driver's side of the steering column.

If it is off, you will find the threaded rod sticking out of the bracket. While you are up there, unscrew the speedo cable. Expect to loose some skin, lots of sharp bits and NO room.

Watch out for the shift indicator cable, it gets in the way.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!