The original wiring on TF trucks had the power to the ignition switch passing through the amp meter. All trucks used an amp meter. It used spade terminals. No telling what you have If someone has modified it.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine