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...looks like the unit I had on my 70½ AAR 'Cuda 340/6BBL back in 1973-74. Here's how that unit worked:
...the drive-shaft unit generated an AC-voltage that you "tweeked" (using RC filter) to create a DC-voltage that went to gauge head.
...the "in-line" fule unit was a varistor (light sensitive variable resistor) that created a resistance proportional to fuel flow.
...MPG = MILES (VOLTS) / FUEL (OHMS) = MPG (milliamperes meter movement)
...it actually worked (sorta), but only during winter months (Yuma, AZ), because vapor-lock during 115-120 degree afternoons caused totally erratic readings...so, it wasn't of much use. Good Idea, but not 100% practical.
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