Reuben,
It is highly unlikely that both rpm sensors are bad. Bob can correct me if I'm wrong but I believe you could also fail the sensor check if you are not achieving 5K rpm. When you hit the AIR button or initiate the start sequence is the engine getting up to 5K rpm?

If you are not getting to 5K I can think of 3 possible causes:
- Check to see that your ECU battery is good and fully charged.
- If you hear a screeching or growling sound when the starter is engaged the o-ring is slipping or
worn. Replace the o-ring and/or put some CA in the o-ring grove to keep it from slipping.
- Replace the starter motor. It takes a speed 300 motor and is not hard to replace yourself if
you have the later level front cover.

Joe