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I have seen poor injection caused by residual air in a fuel line; as @Ray70 points out the fuel regulation and injection is dependent upon the fuel in the line to the injector being incompressible to deliver fuel to the injector. If the air is trapped there, the pressure pulses, but never gets...

Frequency gauges don't have a great reputation for accuracy. If it were me, I would use a frequency (Hz) sensor on a DVM, or hook up a dedicated one, and plug it in to the convenience outlet. I wired up an inexpensive digital one to an extension cord as a portable monitor for generators. It is...