Gas guage stuck on 3/4 tank

[ak_nut]

Hello guys..Today I bought a 87 burb and thought I was comming up seeing the tank was 3/4 full..Well I get it home and pull it around back to start the tinkering ritual and when completed the damn thing would start..Of course Im thinking it cant be out of gas...Well after checking the tank is empty..Threw some gas in and it started right up so the pump is good to go.

The first obvious thing to check would be the sending unit correct??

Thanks