i would put the sun pro gauge on the thermostat housing on the hot side(under the thermostat). you should be able to drill a hole there to accept a 1/8 npt tap. you would have to work under the intake manifold though. but you can also install it on the outlet side. i would drill a couple of 1/8 inch holes on top of the thermostat though so you will have a constant water flow for the gauge to read.
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