gauge cluster issues

[82' monte]

my gas tank meter doesn't work the needle is past full also my oil pressure gauge doesn't work either i guess im going to
try to get another cluster and put in is the first thing i'm going to do but if that doesn't work were should i go from there
any help would be much appreciated.

 

[84e/c]

check the wiring to each gauge first. the gas tank sender wire is pink if i remember right & the oil was brown or tan. def. could be sender units or bad wires/ grounds. good luck.