On a 91 firebird what might cause 10a gauges fuse to blow upon turn of the key Ignition switch is new no visible shorts Gas gauge reads backwards and headlight buzzer continuous when running?

somethings not hooked up right, why did you change the ignition switch...were there any burnt wires? Which fuse? Which circuit? When you disconnect the components controlled byt the fuse is the gas gauge normal? Wiring diagrams and procedures are in a shop manual available at your local library...good luck...