461674 is the part number in the Volvo parts manual for the fuel injector. I suspect VP just uses that as a reference number and that it is an indication of nothing in this particular case. You would need to look at the actual injector. Original Bosch injectors will be blue-green plastic and have a part number molded on them that ends in 036.
Do not try to run the engine with the fuel pressure set to 19 psi. This will change the fuel mixture resulting in a very lean fuel condition. The engine will be very hard to start; but, if you did get it started and it stayed running the very lean fuel mixture could result in damage if you attempted to drive it.
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