Here is my on board air setup on my heep using a York compressor that came with the AMC V8 engine. You will see a lot of variations on this all over the web, but mine is K.I.S.S. so it might not be for everyone. By that I mean it will be manually controlled, and if you plan to use air tools off of your system then you might not want that. I could if I wanted too, but I don't plan on carrying any of those tools with me on the trail, like to travel light.

First off you will want to gather all the parts.

1. York air compressor - came stock on my AMC V8

2. Air tank - picked one up at the junkyard that was used on a Semi-truck for it's air brakes, $10

3. Airline - used goodyear air hose rated for 300 psi

4. Check valve - found at my local hardware store, under $15

5. Air filter - any auto parts store

6. Air separator - purchased at Lowes Home improvement store along with most of the fittings

7. Brass adaptors - these are JIC to NPT fittings purchased at my local hyrdraulic store for under $20 for 2 of these and 2 reducers for the NPT down to 1/4.

Alright, now for the assembly of all these parts. First, connect those JIC to NPT fittings to the stock fittings on the York.

Here are both hook ups, the top is the inlet port to which I just put a piece of brass threaded pipe, 3" long, and the air filter just clamped right onto that pipe, it had a rubber boot with a hose clamp with it when I purchased it.

Now it's time to set up the check valve and filter/separator. Here is the filter/separator with a 3/8's hose barb threaded into the inlet side, this hose will come from the lower outlet on the York. The outlet of the filter I threaded in another piece of that 3" threaded brass pipe with a enlarger fitting on the end of it.

Here is the check valve threaded on. I purchased this check valve from the local hardware store for under $10. Then on the other side of that check valve I threaded in a reducer and then another 3/8's barb fitting. The hose from this fitting will go all the way to the tank.

That tank I got from the junkyard from the Semi-truck works great since it came with 9 ports in it. I welded on some brackets so I can bolt it down and mounted in the bed of the heep. Here you can see the bracket I welded on and some of the fittings, the center port has a large quick connect on it, others have a pressure gauge, plug and safety valve.

There are also five ports on the bottom of this set up. One is air coming in from the York compressor with the other two going out to the front and rear of the heep. Those three are together while there are two on the other end of the tank. One of those is a drain valve and the other will be going up to a pressure gauge in my dash when I get to installing one of those.

As for electrical hook up. This is the easy part, there should just be one wire coming out of the York compressor. You will want to run that to a 12 volt switch. I have a single throw switch on my dash (which means it's either on or off). To that switch I have 12 volts coming in then when you turn the switch on, that 12 volts goes out to the compressor turning it on.