Needs a shunt resistor.
Just one problem. You need two numbers to calculate the resistance value required.
The meter's full-scale sensitivity current. For now, I'll guess what you meant was one milliamp. It's typical to find "fs=" in small print at the bottom of the meter face followed by a current rating.
The coil resistance of the meter. This dictates the actual voltage that will push 1 milliamp through the meter coil. If it's 1000 ohms, you need 1 Volt.
If it's 100 ohms, you need only 1/10 of a Volt.
Once you have these two numbers, calculating the resistance value needed for your shunt can be done.
We use a cheap digital multimeter that has a 20-Amp scale and use that scale for setting final/driver bias. That way if a gator clip comes loose and touches grounded metal for a moment, no damage is done to the meter.
Your meter will be at risk if this happens unless it has a fuse or some other sort of overload protection.
Sometimes the build-it-yourself solution is more cost effective. Sometimes not so much.
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