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I don't recall that. May have been a repair I was doing before the swap. All my lines are plastic now except the fuel supply line from the tank to the primary fuel filter.

Use this discharge line from the compressor to the frame. You can use 1/2" plastic air line from there back to the dryer, and from the dryer to the tanks. Signal line only needs to be 1/4" from the governor to the compressor and from the governor to the unloader on the dryer. Use 3/8" everywhere...

In my opinion, any vehicle that uses air in the braking system should have clean, dry air for that system. It's only sensible that the air pack will last longer and be less susceptible to failure if provided with good air.

Looks like you got the hookup on a connector. You do need a pressure relief valve between the dryer and the compressor discharge. The relief valve on the case will only vent excess pressure in the case downstream of the dessicant package. The upstream relief valve apparently was an MWO on the A3...