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wheel speed sensors

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I am using a GM wheel speed sensor from a C7 corvette. They are NOT tied into the ABS system and are not shared. Can anyone verify the type of sensors they are? Most OEM are using magneto resistive. but these are two wire which leads me to believe they are magnetic hall effect.

The early corvette hubs were just variable reluctance, the late model ones seem to be a current loop (ie current varies), which I wired to a MoTeC M150 as follows: Pin A = signal, with a 200 ohm resistor to ground; Pin B = Power (5.5 - 16V). No pull-up resistor on the ECU and I used a 2V threshold trigger voltage. There are 48 pulses per wheel revolution.

I googled and found some online tech trouble-shooting info that helped me figure out what to do.