If so, it's only 3.6KΩ in series to add.
The schemes have put a resistor of 3.9 is it a mistake? In what capacity is the capacitor?
I discover the metter have a diode rectifier and a resistor of 1,5k but I think the assembled components are of poor quality and no resistance when combined with the 3.6-k
On schematic 3,9K is instead Your 1,6K (5%).
If i'm not mistaken with series connection, You can put 5,2K (1%) instead 1,6K, if You find some.
Simplest way it's only add 3,6k.
If someone knows what germanium diodes, filtering capacitor and resistor add, to rebuild these meter please let us know.
For now i must go, tommorow or late today i'll look for some info.
Biggest problem is that we don't know, what's uA of these meters.