How do I use a 5 pin potentiometer?
Most likely, it's a variable-frequency tank circuit. Try this for a test.

Measure the resistance between the 3 in-line pins. Probably you'll find that the center pin has equal resistance to the 2 ends. Now look at the other two pins. If they read open, then most likely those pins are a variable capacitor, and the adjustment slot varies the capacitance. Basically, it looks like







simulate this circuit &ndash; Schematic created using CircuitLab

(Ignore the + on the cap symbol.)