if you look at the clinometer harness, there should be two plugs on it, one can plug into the other. the harness is a jumper. you pull the plug off the HVAC lights behind the dash and plug it into the clinometer harness, then plug the other end of the clinometer harness into the HVAC light. if your clinmeter harness has been hacked-off, just get some wire tap connectors and splice into the same plug for the HVAC lights