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All three gauges will draw such little current, you can put them all on one fuse tap.
This. I have 3 in mine as well, the third being a boost gauge that is a conventional gauge but with a LED backlighting system. Because all three gauges are LED and pull such a minimal draw, I saw no harm in running all three off the same tap. But, being LED, you need two power taps. One powers the gauge; the other is just a signal that tells the gauges to light up (or, in the case of the gauges you and I have, dim). I forget which circuit I used for the power, but my basic logic was to choose a circuit that turned on with the truck and had the highest value fuse. The logic is that, if the circuit was designed to carry the kind of current that would warrant a bigger fuse, it could handle just a wee bit more and power up the gauges.
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