This is a reproduction speedometer driven gear, identified by both its tooth count and color. Replace your worn out, stripped or damaged original gear or simply use a different gear for speedometer correction when changing...
Classic Instruments Mechanical to Electric Speedometer Drive Cable Interface; w/ Cable
The Fuel Link interface from Classic Instruments is the problem-solver between fuel senders and gauges to correct ohm mismatch and erratic movement due to fuel slosh. Fuel Link is compatible with nearly any short sweep fuel...

Classic Instruments Mechanical to Electric Speedometer Drive Cable Interface; w/ Cable
Classic $162.99 ea
1930-2007 Chevy, GMC Truck; Electronic Voltage Reducer; 6 Volt to 12 Volt Reducer
No need to change out your gauges or senders when running 12 volts in your 6 volt system. Install this electric voltage reducer to any electric gauge. Reduces 12 volts to 6 volts. {fitment}
1930-2007 Chevy, GMC Truck; Electronic Voltage Reducer; 6 Volt to 12 Volt Reducer
Classic $18.99 ea