fuel sending unit

i gota new fuel sending unit from mancini racing a while back when do my upgrade on the car. the gauge in the car is reading 1/4 when we have a half a tank of gas so i took the sending unit out to test. when it reads full it reads 8.7 ohms and when full it reads 84ohms.. these numbers are off from what the ohms should be so does that mean the unit is bad?