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I have cobbled up a Kavlico sender to a cheapo Actron
mechanical gauge (1/8 NPT fitting)and an aftermarket
fuel pressure gauge. Idea being to have in-cabin fuel
pressure visibility without in-cabin fuel. These two agree
well. The output could be tapped out and put to the EIO
interface as well, or you could cobble up your own bias
circuitry. You can get the transfer curve data V/PSI
from Kavlico. But I'd be looking for the same ground-offset
issues as with widebands.