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How about drilling and tapping a hole for the other sensor in the water outlet? Some later model outlets are even set up this way for thermal vacuum switches. That way, you would be modifying a cheap, readily available part, or using a junkyard part. You could also install it in the upper rad hose, like those old CA smog device kits had. Or, better still, plunk down the Big Bucks and get and install a Rally Cluster dash, that comes with the guage!!!! Have fun...
Jeff
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