fuel gauge question

Pantera fuel level sending unit spec:

Full = 0 ohms

Empty = 200 ohms

Purchase the Auto Meter fuel gage with a range of 0 to 240 ohms. You then have 3 options of how to use the gage.

Option 1: do not modify the measuring circuit

The gage will be accurate at full, but would read 17% full with an empty tank.

Option 2: add a 40 ohm resistor to the measuring circuit

The gage will read 83% full when the tank is 100% full, but will be accurate at empty.

Option 3: split the difference, add a 20 ohm resistor to the measuring circuit

The gage will read accurately at 50% full. The gage will read 92% full when the tank is 100% full, and the gage will read 8% full when the tank is empty.

cowboy from hell

Go with option 2 (accurate at empty), Kind of important …. The empty part.