Remove the negative lead from the battery. Set the meter to amps. Attach the positive (red) lead to the battery negative terminal. Attach the negative lead to the cable.
With the ignition off, the meter should read zero.
Switch the meter to milliamps. It should still read zero. If not, find out what is draining the battery.
Wanted: Dead, smashed, crashed or trashed gauges
BMW GAUGE REPAIRS - TACH*SPEEDO*CLOCK*VOLT METER *PODs & LIGHT BOARD*