CB Custom - Speedo/Tach Wiring Issues

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Guys this may be helpful to explain how these sensors can be tested and how they work;
https://www.tiepie-automotive.com/en/art...ensor-hall

It seems an adaptation of the 4-20 mA system, you supply a dc voltage through a resistor from the controller end to a two wire hall effect sensor, the sensor changes the current in the two wires by switching in a load ( in parallel ) with each " post " that travels past it's surface which changes the current through the sensor.
The sensor uses 5 volt logic and thus needs just over 5 volts to operate, the rest of the 12 volts now acts to convey the speed sensor data pulses ( frequency or speed ) to the controller
This also changes the voltage measured across the sensor leads which is exactly what PG's scope shows.
Apparently the controller recognizes this signal and translates this in abs and/or speed sensor lingo.

So any multi meter should be able to measure the " gaps" when connected across the sensor connector and as long as they are presented very slowly so the meter can react to the varying voltage on the two sensor wires, you would expect the meter to indicate something like 6 volt dc on a post and 6.5 volt dc on a gap, ( for example ) so read the meter carefully, as long as there is a clear and repeatable variation in voltage.

Have not actually done this on my bike but with PG's video this seems correct, the trick is to understand how the pulses are being generated and delivered to the controller.