Yes, use the acc 12 volt fuse for power. You can use this to tap into the fuses, just buy a small pack of fuses of the same amperage. This Add-a-fuse is available at autozone: http://www.amazon.com/Bussmann-BP-HHH-ATM-Add-A-Fuse/dp/B000GKEXK2
You can ground the gauges using a bolt by the under dash fuse box. There is a grommet behind where the stereo is and under the top mount intercooler, it is extremely annoying to get to and feed wires through, I opted to go for the grommet to the left of the clutch, it goes into your fender and into the engine bay easily. You can use the boost line coming from the BPV, there should be a T fitting. I used Zip ties to secure the lines to the fitting, just in case.