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Checked out the TM and saw the pics and yea mine same unit. Googled and found this document about it. It is for testing the fuel filters for clogging and as you said part of the STE/ ICE. a181563.pdf (dtic.mil)

OK went to books and it does say there can be a fuel temperature gage for the ECM and that makes more sense. It would not do flow rate on mine because it it just a tap on a T on the high pressure side of the pump line. Then that would also seem like it would not do pressure just flows fuel...

Got me thinking which is getting harder these days so I opened my hood. Mounted on my block just above the fuel pump is an electric block 1 1/2''x 4'' with in and out fuel. Mine is tapped into the pressure side of my pump and returns to the final fuel filter. I saw it when I first got the truck...