Fuel senso=r

I'm looking for fuel sensor that can monitor fuel or oil level.
my budget is only $20. I found one online but this one is GPs ultrasonic and too expensive. https://www.abestmeter.com/ultrasoni...-level-sensor/ Hoping to get one from you guys. We're moving on to a new house this coming Nov and I'm cleaning my garage and hopefully do a buy and sell. I have lots of tools 1 Socket Set, Pliers and Wirecutters. Torque Wrench, Dead Blow Mallet, Zip Ties, Multimeter, Lubricants and Cleaners, Desiccant and Etc. But right now I'm looking for an oil sensor or fuel sensor.