Switch Circuit includes circuit board, a pop rivet used for installation and an instruction sheet for easy installment. If your 914 hesitates at certain throttle settings or stumbles when you start to accelerate, your circuit board is most likely deteriorating at the connector. Regular wear and tear causes the meat on the circuit board to wear off and the ECU will no longer be able to get a value for this input. This switch circuit is a great replacement to get your 914 running like new again.