How to read an amp gauge

So I've just finished the wiring in my 1968 dodge dart,and wired up the amp gauge,when you turn your car on but not start it should the gauge move to the the charge side of neutral?
Should move slightly to the discharge side, as you're drawing power from the system. You may have it wired backwards? Try turning on the headlights without starting the engine. What way does it move then?