Please assist in making a circuit that can display a voltage reading of 0 - 5Vdc (variable) and display the input with a factor of "x 200".
Thus 0.5VDC = 100"on display"
1.0VDC = 200"on disply"
This circuit must be tiny and able to display all voltages from 0 -5VDC as multiplied by 200.
I have a tiny 2 -30Vdc voltmeter disply that I would like to use.(See attached voltmeter availible)

 

You can scale down easily, i.e. go from 50V to 5V but you cannot scale up as easily.
What you need is a voltmeter that reads 200mV or 500mV full-scale and use a voltage divider.
Or you can use a 2.00V full-scale meter and then disable the decimal point.