Gauge Never Reads Full

Check system with Gas Gauge Tester, positioned in line between feed wire and tank terminal. If gauge reads full, fill the gas tank. Using an ohmmeter, check resistance of tank sending unit. Resistance should be between 88 and 92 ohms. If ohm reading is low, check tank mounting area for damage. If gauge does not read full, check connections to printed circuit or for an open within printed circuit.