BD wrote:

I have a 2002 225 Merc EFI and want to hook up a FLO Scan (Series 5500)
or other Fuel Computer, like the Standard Horizion Fuel Flow meter or
the NavMan Fuel Flow meter.

On the FLOScan, I see the on the gauge it shows gallons, how does it
know , if say , you have 75 gal in the tank and add 45 more gallons. Is
there and way to adjust this? Same question for the Standard Horizion
and NAvMan.

They all show the GPH but im curious how the gauge knows how much fuel
is in a half full tank. Or do you just need to start with a full tank

On the FLOScan I gues I would need the 0-32 GPH. Anyone have a 225 Merc
EFI with some GPH numbers and rpm.

Thanks


I have the cheaper Standard Horizon on my Parker. It knows how much fuel
is in the tank because you tell it. My Parker holds 170 gallons, or so
the factory says. If I fill it up, I set the gauge to 170 total.

Standard Horizon has downloadable manuals on line.