I noticed the metal arm that connects the float to the resistor sits a little loose in the bracket. This bracket also connects the contact pad to the resistor board. When fuel sloshes around, the contact pad also sloshes around and doesn't make the best connection to the board. For those of you who didn't know, this is how your gauge determines the amount of fuel in the tank - by a steady change in resistance.
2506035F01 is the part number for a new pump bracket assembly that also includes the float and resistor. They're priced from 270$-310$. S13s seem to be the only model with this design (you cant find one on another nissan model) Being as old as our cars are, theyre becoming increasingly rare at the junkyard as well (for those so inclined as to put in another old *** replacement part)
Here's what I did to ensure the contact pad always makes a solid connection to the resistor board. It may be ugly and ghetto, but paperclip for the win and it works. Everything is solid and the resistance readings are fluid and smooth throughout the range now. Just thought I'd share for the day someone else has this issue.
