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The Cylinder Head Temperature (CHT) – Gasket Type (Washer) – You may install the probe on the upper or lower spark plug (the one that provides the best correlation with the other temperature probe). Due to the sparkplug location, the gasket probe may read 25’F higher (generally the sparkplug is the hottest part of the cylinder, which will cause this discrepancy).

• 1 Thermocouple Type K CHT Gasket Probe

The Cylinder Head Temperature (CHT) – standard Bayonet – probe, has a captive 3/8-24 boss which is screwed into the base of the cylinder. The CHT port is predrilled by your engine manufacturer. The CHT probe has a screwdriver slot to facilitate tightening.

• 1 Thermocouple Type K CHT Bayonet Probe