Fuel Sending Unit Help?

[fixkick]

Hi everybody, first post here. 
Recently bought a 1990 Geo Tracker with 97K miles. The guy I bought it from put in a new fuel tank and pump, but did not install a sending unit. I can’t find one new anywhere. 

I’m sure there are others on here that have had issues finding OEM sending units. 

However, I did find a “universal” one that’s adjustable for depth, and that reads empty at 240 Ohms, and reads full at 33 Ohms. I know from other posts here that Gen 1 sending units typically read around 120 empty, and 3 Ohms full. 

I know next to nothing about sending units. My experience is with the mechanical, not electrical. 

Will this “universal” unit work?!

https://www.oreillyauto.com/detail/b/aut...unit&pos=3

Please help. 

the sending (fuel level) unit is only a variable resistor. vary simple and crude,  1920's year technology, for sure.
fitting the hole in the tank and not leaking is the big issue here,  

seen here.

http://www.fixkick.com/sensors/fuel-gauge-tests.html


full is 3 ohms,
you can test the gauge before putting it in,  connected.

The fitment can vary by year and if 2door or 4doors, car.  (tank sizes are not the same on 4door)