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Wow, Why drill a hole when all you have to do is unscrew a 1/4 npt plug and install the thermocouple in the exhaust manifold, maybey its to quick and easy. No number adding to mess with, and 20 minutes later your done. 2cents

Here is a 3" stewart warner, its a nice quality gauge. I like it because of the colors on the gauge, just a quick look and you know were your egt's are. That way you can spend more time looking at the road. I installed the thermocouple in the front port of the exhaust manifold in the 1/4" NPT...