Tacoma Regular Cab 2WD L4-2438cc 2.4L DOHC MFI (1997)
Vehicle Speed Sensor/Transducer - Cruise Control: Testing and Inspection
Vehicle Speed Sensor
INSPECT VEHICLE SPEED SENSOR OPERATION
Check that there is continuity between terminals A and B 4 times for every revolution of the speedometer shaft.
If operation is not as specified, replace the speedometer.