Is your Exhaust Gas Temperature (Pyrometer) Gauge acting goofy, giving inaccurate readings, or maybe not at all? Or possibly you upgraded your exhaust manifold and can't get the old pyrometer probe out of the original manifold? Either way, this is a direct replacement for ISSPRO pyrometer gauges that feature a plug in style connection (instead of eye loops). The thermocouple is 1.6" long and features a 1/8" compression fitting for 1/8" NPT (National Pipe Thread).