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I have finally selected and installed an on-board compressor. I selected a Mean Green 2Air from Opposite Lock (they were on special). It pumps my tyres from 24psi to 30psi in 25 seconds.
I have attached some images to show how I have installed it. I have used 6mm tubing to go to the pressure switch because the compressor is on the opposite side to the battery and it meant less wire. I ran the wire for compressor through 10mm loom tube with the 6mm tubing to make for a very neat finish. Power is connected to battery via 50A fuse and 40A relay. I have attached a circuit if anyone is interested.
I also have an air point at the front on the bullbar (using 8mm tubing through grill). To prevent any dirt or muck getting into connector, I use 25mm chair leg rubbers from bunnings and a bit of foam hose.
I no longer need to pop the bonnet to pump my tires up now.