ABS Wheel sensor signal generator

[Mike Turner]

IIRC, my 86 vette has 63 teeth on the ABS bearing. The sensor appears to
be a Hall effect (filings magnetically held to head). I would make a
trip to the local yard and acquire one for your year, breadboard it up
(12 and GND), and just supply a similar signal to the ECU. If DC, just
use a 555 or a PIC directly coupled and correctly GND referenced. If AC,
do the same but capacitively couple the signal.