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Old 03-18-2013, 12:42 AM
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Yes, pretty sure that's the park gear
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Old 03-18-2013, 01:17 AM
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Originally Posted by TheDon View Post

I think what I've found is the park gear.
This may give you some idea of what to look for.

The left is the parking pawl for the 722.4 with the mechanical speedometer, while the one on the right is the one from the 722.3 with the VR trigger wheel (note the 4 tangs that the sensor reads)

I'd be looking for something somewhat similar, but I don't see it in the diagram. It's possible they are using the parking pawl as a trigger. The '85 Cali 617s pull the tach signal off the flywheel teeth so it's possible that there is some double duty thing going on.

It's also possible that there is no speed sensor on the tranny. If the car has ABS it's likely that they're taking the speed signal off the ABS sensor in the wheel.
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W124 Mechanical to Electronic Spedometer-parkingpawl.jpg  
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Old 06-14-2017, 05:46 AM
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For anyone requiring speedometers to work for different rear end ratios, you can send the speedo to a shop and have them simply recalibrate it after swapping to your new diff. All you need is a gps and speedo readings at 30 and 60 mph and they can work their magic. Forget about ratio adapter boxes. Cost is the same and no wiring needed (cheaper to recalibrate actually, but not by much).
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