I made a power supply for testing tank cpacitors for an am transmitter used for welding steel tube, the supply had a lopty, for the meter on the front panel I used a 'christmas tree', basically just a load of standard resistors in series, you divide the apllied volatge by the no. of resistors to get the volts per resistor, I think I used 20.
If you google for thevenin calculations you'll find online calculators for dividers, usually the divider impedance is 10 times less than the load, your meter is 10m so the divider ought to be 1m, 1m might be on the low side it'll pull the supply a little, if your sure of the meters impedance and that it wont change with volatge you might be able to just put one resistor in series with it.