Knock Gage Installation Kit with BLK Face and BLK Trim.

This kit permits installation into your supercharged 3800 which uses two GM Piezo-style Knock sensors. Attaches to the engine KNOCK sensor wire in the engine bay, under the rear header. Displays severity of detonation using three different colors on the LED display. Gage is standard 2-1/16" diameter. Comes with ESC Converter module, wiring harness, BLK Face Knock Gage, and toggle switch. DOES NOT INCLUDE KNOCK SENSOR. Wiring is simple: Three wires, POS 12v, NEG 12v and signal attachment to Knock sensor under hood. All Plug-ins included.