Now all I have to do is fish a wire out to the sensor and hook up the gauge.
(just a directory of pictures, I'll do a writeup later)
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It didn't go so smoothly. The gauge and tube took a while to figure out (no hole install) :) But I had to take the A pillar plastic off one more time than I should have had to. (didn't get the wires in properly) and broke the friggin plastic/metal clip thingy. :( Well, I'll have to JB weld it back later, but for now it's fine.
Amazing what you can do with PVC pipe.