Revolution Sensor
WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
Revolution sensor detects speed of idler gear parking pawl lock gear and emits a pulse signal. The pulse signal is sent to TCM, which converts signal into vehicle speed.