Sorry, was out of the office traveling for the diesel World Finals. As mentioned above, virtually all exhaust gas temp gauges use a Tyke K thermocouple. Main thing we would have to know is how the thermocouple is mounted into the exhaust (1/8" NPT fitting, 1/4" NPT fitting, or band clamp), the type of electrical connection (sealed connector or ring terminals), and either the length of the probe or the diameter of the tube section you are going into.
Regards,
Michael Pliska