For97–98 LS1 and other GM applications. 1997–1998 Corvette 350 LS1. 3 Wire Coolant Temperature Sensor Harness Connector – 97–98 LS1 GM ECT. 1998 Camaro 350 LS1. 1998 Firebird 350 LS1. 1 × LS1 3-Wire Coolant Temperature Sensor Wiring Connector (pigtail).