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This is interesting, how are the plastic housing PPS gauges different? Are the spools part of the brass base or are they a different diameter than the spool that goes in the hose?
I ran across this old image of an Oceanic SPG housing I hacked opened to show the direct-dive helicoid pressure senor, which is more shock-resistant than traditional Bourdon Tubes. I would check but can't find it at the moment.
I was visiting Bob Hollis when the tooling to make these helicoids was under development. Roylin's (later 3D Instruments) patent on the mechanism had recently ran out.
The PPS plastic gauges and the PPS transmitter are different designs. The PPS transmitter (what Shearwater calls their "legacy" transmitter) and the DGX flanged spool ARE compatible. The paragraph in the product description has been edited to make this more clear.