Fuel gauge finally works, but only briefly

Dana67Dart said
What does the temp guage do?

How much fuel is in the tank?

What sender did you buy?

My temp gauge isn't hooked up.

There's 6 gallons of fuel in the tank (18 gallon tank)

i bought this sender from JEGS JEGS 78896: Fuel Tank Sending Unit for 1968-1970 Dodge Charger, Coronet, R/T, Super Bee & Plymouth Belvedere, GTX, Roadrunner, Satellite - JEGS

and it's a 69 Roadrunner