gas tank sending unit

Gauge reading near empty so i got the ohmmeter out and it reads 60 ohms...73 is empty,
at 60 my gauge seems correct.
i thought there was more gas in it than that so i syphoned the tank and got 8 gallons....
...now either the sending unit is defective,stuck or the float is full.
if i need a new sending unit can someone recommend one...there are many $30 - $100 ???