The fuse is on the Brown jumper in the glove box fuse box. If you look at the AS manual it shows were on the grid (brown) the air compressor is (25amp?). I think you have the oil pres switch like I do so the compressor will not come on till the motor is fully running and making power.
I jumped mine off the water pump till I change the 454 out. In this post thy talk about the oil switch some were on the left side of the motor I think.
The PO used a stainless steel fire extinguisher that he drilled and taped for the air tank.