Battery/Amp Gauge

[gschroeder]

I have a 1970 CST10 with a stock battery/amp gauge. The gauge needle is basically always right in the middle (between the D and C). If I rev the engine, the needle barely moves toward the C (and I mean barely moves). Is this normal, or do I need to replace my gauge? I would think the needle would move more when the engine revs, lights turned on/off,... I did test the battery and alternator, and both are good. Battery is at 12.5 volts when engine off, and jumps to 14.5 volts when engine/alternator is running. Also, I did confirm the gauge does have power to it.

Thank you