Fuel Flow Meter/Gauge Questions

[Bushwacker]

I have the Lowrance/BRP I-Command digital gages and they seem to work well. The fuel flow and total fuel usage are calculated based the fuel flow/speed/throttle opening maps built into computer rather than an actual measurement, but generally seem to be fairly close to the old Flo-scan meter I've had for years. I have had occasional electrical gremlins with the Flo-scan meter (bad ground, bulb burns out, corrosion on connectors, etc.), so if anything I'd say the I-Command system is more reliable, although maybe not as accurate. When I start the motor after it's been sitting for a couple of weeks, the Flo-scan gage will jump up to 8-10 gph for a few seconds, like some fuel in the lines has evaporated and is being replaced, and of course the I-Command calculating system won't pick that up. The Flo-scan Totalizer generally seems to read a little higher and I tend to trust it a little more (except when the gage has been acting up!)