Yes, you read that correctly.  Richard Charles figured out a way to keep the factory A/C on his 88 22RE truck and also install second compressor to feed an onboard air system.

    Recently, Richard had his engine out for some work - here is another picture of the idler bracket for the second compressor (the block is on an engine stand, upside-down)

    In the mean time, I do know that this project involved lots of time to get the brackets right.  It took several fittings to find the best position for the compressor, as well as a pulley system that would be acceptable.   The second compressor is located on the passenger side of the engine at the bottom.   a generic idler pulley was arranged to get a belt to work the system.  The compressor feeds 2 retired fire extinguisher bottles located in the bed of the truck - one on each side.