So if you are trying to use the FC OE wheel speed sensors you will find the information that follows useful.

The FC3S RX-7 has four wheel speed sensors (if equipped) that have the following characteristics.
Magnetic Reluctor passive sensor
Tone Ring diameter of 142mm with 90 teeth each tooth duration and gap is 2.5mm each.
The OE Wiring FA-02(S4) or O-09 (S5) Connector has the sources for the speed sensor wiring.
Rear Right
Y/L = +
Y/G = -
Rear Left
W = +
Y = -
Front Right
G = +
L = -
Front Left
O = +
L/G = -

Now as for the setup
They are Magnetic falling edge with thresholds of 30mV to 1.1V DC
Type: Magnetic
Trigger: Falling Edge
2 point Arming Threshold;
Off less than 0.025v

On Greater than 0.03v
Scalar Values;
Scalar (tone ring) = 20155
Scalar (rolling wheel speed) 225/55R16 = 4529
Pull Up = Off


Below are the scoped wave forms both in AC and DC using the polarity wiring as shown above.

AC Scoped Wave Form

DC Scoped Wave Form