So, I finished installing my 10 gallon RCI fuel cell this past weekend and I found out that the sending unit that comes with them are reverse of what the honda gauge is. It is 0 ohms for empty and 90 for full. I put a 20 ohm resistor on it because the honda gauge is 11 or so ohms for full and 110 for low.

Any suggestions on a sending unit that might work? Right now I am just going to read the gauge backwards I guess.

Note: This car is an autocross car, so I went with a cheaper non-bladdered fuel cell.

 

I used a summit sending unit that reads 240 empty and 33 full. It works, but does not use the full range of the stock gauge. It tops out around 3 bars from full and bottoms out around 4 bars from empty. I just marked out the unused bars on mine. If I did it again, id use one with a 70-10 range. Link http://www.summitracing.com/parts/sum-290183/overview/

 

Thanks Bryan. I didn't realize they made sending units with full being high resistance. It seems like the standard is the 0-90 ohm unit.