how to install gauges? Options

[6strngs]

so, I know a bunch of people have installed aftermarket gauges on here, yet there is no how-to! So, could somebody make one? I mostly just need to know which wires are easiest to splice into for power and stuff for gauges on my A-pillar. also, how can I get the wires into the engine bay? Do I need to drill a hole, and if so, where is the best place to do so? I don't want to see wires in my passenger compartment, but I don't really mind if it's not that clean in the engine bay. so, any help would be great. thanks

[6strngs]

so, before I read your reply, I went out and bought a voltage tester thingy. the kind where you just put the clamp onto a ground then tough the tip to a wire and if there is voltage in the wire a light will light up in the tester. what I discovered is that none of the wires in the A-pillar have switchable power. though 2 do have power even with the key out. but yeah, I was using a razor blade to cut into the wires so I could put the tester to them. I just did it to some red wires because I thought those would most likely be power. and while cutting into one I accidently cut into two. there was some smoke and a spark. and in the confusion I managed to cut my thumb with the razor blade... deep... what's worse is, now my alarm/keyless entry doesn't work. I checked all the fuses. the ones in the engine bay and the ones in the dash. none of them are blown! so I have no idea how to get my alarm to work anymore... and if I'm going to be putting some expensive looking gauges in my car, I definately want an alarm.


Anyway! so, you just hooked straight up to the battery? so your gauges would be on even with the car off and the key out? is that why you installed the switch?