**** this is installed in my silverado, mounting locations will vary in a ranger.
I set up an onboard air system using a compressor that many in the offroad community have heard of....the tsunami MF-1050.
Here is a break down of the items I used and their costs.
MF-1050 compressor- $60 at pepboys
7 Gallon Air tank - about $20, I had one already and while its not the idea style tank it works for now
20' 3/8" Air Hose - $12
Miscellaneous Fittings - $10 plus those that I had in stock
1/8" Air Line to run gauge to cab - $5
Pressure Switch W/ Relay 85 psi on, 105 psi off. - $23
Switch to turn compressor on/off in cab - $2
Misc Electrical fittings - Had in stock so free.99
Misc nuts and bolts- also free.99
Total Cost - $132
This is the pump
Rated at 150psi max, 2.5cfm @0psi 1.5cfm @90 psi 40 minute maximum run time, and it will auto shut off at that point due to heat.
it comes with a nice carry bag, power cord w/ built in battery clips (too powerful of a pump to plug into the cig lighter) has a waterproof on off switch, air hose, and spare 30 amp fuse.
The major problem with this pump is it uses an oddball fitting on the pump itself, luckily the hole that is threaded for that fitting is the perfect pilot size for a 1/4-18 npt tap. so take out the old fitting, tap it and install a standard fitting.
Now that that was out of the way it was time to hard mount it under the hood. Thankfully I have a great spot, the 2nd battery tray, unfortunately none of the bolts for that will line up w/ the base of the compressor (you have to remove the little rubber feet to access the holes) so you have to drill and use your own hardware.
here it is mounted
now to wire it in, this is pretty simple, just cut off the battery clamps, and put ring terminals on their and connect it to the battery. Fuse is already built into the power wires. Now once i get enough money to buy the pressure switch/relay combo, ill have to snip the harness, install the switch where the factory gauge goes on the pump (its not accurate, and ill have one on the tank so no use on having a gauge under the hood) I am told the hole for the gauge is standard 1/8" npt but we will see it may need to be tapped.
Now for the air hose
I ran that down along a wire harness that comes from the fuse box down along the frame, I ran the hose with zip ties along the top of the frame rail to protect it, and then up past the fuel fill neck and into the bed through the hole that is up under the bedrail,
you can kinda see in this pic how its routed near the bed
I still have to cut the hose to length but i didn't have any more compresson fittings like i tought i did.
On to the tank,
It is from walmart the 7 gal blue tank, it has a base on it w/ 2 mounting holes, I drilled 2 holes into the bed floor, ran 2 bolts up through them and put a nut on each to keep them from falling back through the bed floor, I then slid the tank on and 2 more nuts/lock washers hold it down.
I used a pair of T's on the top of the tank, one with a built in safety valve, installed the hose in one end of the 1st T, and another T in the second end, a gauge and a quick coupler are connected to the 2nd T. This gauge will be relocated into the cab once it cools off around here.
here it is mounted under the tool box
I have a awesome onboard air set up, that actually has decent power, The tank pumps up from 0-100 psi in about 2 1/2 mins, and the 85-105 psi that it will have to do with the pressure switch takes just over 1 mintue. I ran an air ratchet off of it for a little while and that seems to do okay, although thats not what I intend to use it for (air tools) but it works great for pumping up tires, and will be nice blowing off the truck after I wash it (in the mirrors and such where water always drips out)
any questions or suggestions just ask, ill update after I use it a bit, and install the pressure switch and in cab gauge and master power switch.