Transfer Flow engineers have developed an ingenious automatic fuel-transfer system, which electronically monitors the level of diesel in the OEM main tank. When the fuel level on the OEM gauge ...

Transfer Flow has introduced a 70-gallon toolbox and fuel tank combo for 1999-2016 Ford, Ram and GM full-size diesel trucks.

Transfer Flow introduced a 50-gal. high-capacity replacement fuel tank for the 2016 Nissan Titan XD diesel truck. The Transfer Flow 50-gallon midship replacement tank will provide Nissan Titan XD ...

Designed for 2018 to 2020 model year crew-cab Ford F-150 trucks with either 5.5- or 6.5-foot beds, the new Transfer Flow tank expands fuel capacity to 45 gallons.

So, in simpler terms, you have one fuel gauge for the whole 19 gallon tank and a separate one for the last 4.75 gallons.