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It works!
I had to modify the wiring a bit to accommodate the electrical parts I have on hand. The PS unit controls a normal 30 amp automotive relay, which then switches a Toyota PS solenoid relay. That controls 50 amp power to the PS unit.
It was a bit of fun to make the pressure hose from -6an braided stainless steel hose. I could use the return hose with no modification.
The steering feels normal when the PS unit is running, even with the engine turned off.
The system has been flushed of most of the old fluid, and has been bled. I still have to connect up the VSS signal. I will probably leave the IDUP and the EFI signals alone for now, since the engine computer should be able to compensate for an increase in electrical demand caused by the PS unit, and the PS unit powers up by itself.
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