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Go to a parts store and get a brass plug of the correct thread to plug the hole, not a bolt. Brass plugs, like coolant sensors, use a tapered thread so that it seals more and more as it is threaded in. They cost less than a dollar and would definately be worth the trouble of having a leaky housing.
Those gauges look pretty nice. I have no clue what quality is like, but a full sweep gauge in electric would be nice. Another thing to consider would be the size of the gauge sender. Space is tight between the WP housing and the alternator. One more reason my mech gauge wouldnt work there.
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