Right, I've got some time to spare, so I'll write as much as I can for you:
For the air suspension I ran 11 wires through my car, which were:
2 wires of 12 gauge. These are for compressors. I am only having one compressor, but I thought I'd put in another whilst everything was apart, just in case I need it for a future upgrade.
9 wires of 16 gauge. 8 of these are for the solenoid valves (4 for inflate, 4 for deflate), plus one spare in case I need it for something else, like a light or something.
This may help you: My Oldsmobile is a full size car - 18ft long. My wire lengths were 18ft, and this allowed plenty of length to run from the right hand rear corner of the boot (trunk), through into the rear seat area above the right hand rear wheel area, down the rear seat back area, across towards the transmission tunnel, along the tunnel and up the front bulkhead to under the dash, plus about a foot over to give me some choice where to put my switches.
Obviously you will need a power supply from your fuse box to the switches, then the switches will operate your solenoids via the 8 wires to the rear (assuming your valves are going to be on your air tank like mine). The 18ft wire length was an estimate that turned out okay!
I also found that 15ft of wire was fine for my stereo wiring to the rear, following the same route from under the dashboard but finishing up under the rear shelf, and not going right to the back of the boot (trunk). I have 2 rear speaker wires, one amplifier supply wire (heavy gauge - a proper one!), one amplifier control wire and a pair of RCA leads (to go to the amp). You must separate the amp power supply lead from the speaker wires and RCA leads, it may cause interference. For this reason I ran the amp supply wire down one side of the trasmission tunnel with the 2 compressor wires, 8 solenoid (+1 spare) wires, then ran all the audio wires down the other side. This set up is for 2 6x9 speakers on the rear shelf, plus an amplifier in the boot (trunk) to power a sub. The wiring for the front door speakers was about 9ft, and is plenty long enough to reach the doors + some extra to play with. I taped up the ends of my RCA leads so that they didn't get dirt in them when I ran them under the carpet.
To arrange the air suspension wires was a bit of a job! I just bought one length of each gauge to the total required length, then measured out 3ft on my bench. Next - without forgetting as I counted - I counted up 6 x 3ft = 18ft and cut the wire off each time. After a while I had I nice tangle on the floor! Then I gathered all the wires and taped them at one end and spent ages straightening them into a reasonably tidy arrangement of 11 strands. Next I worked from the taped end and cable-tied them together with ties about every 18 inches. Finally, I removed the tape from the end and attached a masking tape tag to each wire at each end. On one end I labelled them according to the valves, so I had:
flp, fld, frp, frd, rlp, rld, rrp, rrd, plus the spare which was labelled 's'. Note: f=front, r=rear, l=left, r=right, p=pump and d=dump, so for example rld=rear left dump, i.e. to the rear left deflation solenoid)
The two heavy 12 gauge wires were labelled c1 & c2 (c = compressor).
Here's a good tip: Don't attach your tape tags right near the end because they will be in the way when you wire up. Put the on maybe 8 or 9 inches down at each end. I did mine a bit too close to the ends! You need to leave your tags on for future reference, once the wiring is installed (I also labelled my speaker wires in the same way).
When that lot was done I had to find the other ends of each wire amongst the group and label each one correctly. For this I used a continuity tester (a multimeter, set to detect a circuit). Then I held one meter lead onto a labelled wire at one end, then touched the other meter lead onto each of the unlabelled wires at the other end until I got a reading. This meant that I had found the other end of the wire! So, I simply wrote the same code onto the the other end of the wire, eg, 'fld' or whatever it happened to be. After all that fun I had something usable to run through the car!
I took a picture of my wires before I installed them (what a great subject to photograph!). I have just uploaded it to my cardomain.com pages so you can see what I'm on about - it's on page 3 (use the link in my signature section below).
Hope this helps
:cheesy: