Some info about Accelerator Pedal Position Sensors (APPS):
This sensor is used to on your vehicle in place of a traditional throttle cable. Mounted on your gas pedal, it measures the driver's input on the gas pedal.
w/Detroit Diesel Electronic Control (DDEC) System III or IV w/Idle Validation Switch w/WM526 Series Air/Electronic Pedal Eng Mfr: Detroit Diesel
2003 Gillig Low Floor equipped with 8.7L 6 Diesel, 8.5L L4 Diesel Turbo/Aftercooled
w/Detroit Diesel Electronic Control (DDEC) System III or IV w/Idle Validation Switch w/WM526 Series Air/Electronic Pedal Eng Mfr: Detroit Diesel