FORD FAIRLANE INSTRUMENT CLUSTER GAUGE

With A Full Tank My Car Reads Only 3/4. It Seems To Go Down As Gas Is Used But Runs Out At 1/4. I Pulled The Sending Unit Out And It Looks...

Can You Give Me Some Idea Why My Gas And Temp Gauges Peg Out When I Turn On The Headlamp Switch? They Appear To Work Fine Until The Wsitch...