Now to spec out the Rn resistor. 560Ω resistors are readily available, just need to figure the wattage.




... and on ebay ten 560Ω resistors rated at 1/2 watts for $2.22 https://www.ebay.com/itm/394630335733

When I took apart a fuel level sender that I had replaced years ago, I found that at least one reason for this sender's inaccuracy was due to bunching of the circuit board wires. In my picture this bunching was predominately where you can see the black coloring below the wires.

I first cleaned the board with Deoxit then straightened the wires with a stiff nylon brush and brass brush as required. I then cleaned the board again. I checked the sweep of the sender's pickup and taped off the board. I applied JB Weld to the top portion to afix the wiring.

"JB Weld’s formulation is designed to provide strong, durable bonds that can withstand various chemicals, including gasoline. Its epoxy resins and hardeners create a bond that, once cured, is resistant to heat, cold, and chemical exposures, making it a contender in the realm of gasoline-proof adhesives." from https://welderology.com/is-jb-weld-gasoline-proof