The Hall Sender is inside the dizzy 180 degrees opposite from the point where the wiring harness plugs in on the side. On CIS-E Jetronic 16Vs the slotted wheel rotates to "signal" the KS control unit that the engine is running.
This signal is only important if you are concerned that your fuel pump relay is getting a ground while the starter is turned over. Absence of a Hall Sender signal means no continuous ground to the fuel pump relay (i.e. you can crank 'till the battery goes dead, yet no start).
Check the Bentley Manual to see where the CIS-E Jetronic fuel pump relay ground originates from if you are curious...
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