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They come up on eBay on occaision for less.
It senses the oil pressure in the heads. That high pressure oil is what drives the injectors (they're individual hydraulic pumps). The signal from the ICP sensor goes to the PCM, which uses it to send a control signal to the IPR (Injection Pressure Regulator) to regulate the pressure of the HP oil for various running conditions.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here
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