JD GP water temp gauge

My 1931 GP doesn't have a temp gauge and I would like to add one. I don't really see a plug in the upper water pipe and was wondering where
is the best place to put it. There is a pipe plug in the head on the flywheel side, is that where it goes. Thanks in advance.
 
You could always put a MotoMeter on it.
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My 1930 had a JD gauge on it when I bought it. It was shot and not repairable so I installed a generic water temp guage. My water pipe has a threaded port on the left side where the original guage was. Sorry, it is sideways, left side is top.

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I didn't think they had water temp gauges until 1937 or after . I have a 1935 B that had a gauge installed later.
 

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