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Pop into your local halfords and have a sneaky peak at the instructions in one of the boxes! I've thrown mine away and it's too fiddly to take out again!
They are mechanical so no sender needed. Make sure you have the correct T piece with the brass restrictor inside it or else you will not get consistant boost readings.
for power i wired mine to the lighter socket as its on the ignition switch, mine is a stepper motor gauge so made my own power loom and works fine, as for earth i used a nut on the pedal box i think it is cant remeber now but fires up everytime and does its auto check.