Above or below the throttle butterfly on SOME carburetors. ‘Marvel’ carburetors have a 1/4-24 threaded plug in the neck. Remove and place the probe in that location.

The Carburetor Temperature Probe (CRB) probe, is installed in the Carburetor throat. The CRB probe has a captive 1/4-24 boss that is screwed into the carburetor throat.

Use the J1 connector harness and insert the yellow wire into the connector pin 5 and the red wire into pin 6. All wiring must be type K thermocouple wire. Do not splice ordinary copper wire in any temperature probe circuits.