On Tuesday, January 1, 2013 8:19:55 PM UTC, wrote:
The issue will be obtaining a suitable shunt ... assuming I use a 1 ohm shunt, anybody made one of these ?

You don't "make" a shunt, you find or acquire one, then you calibrate it, according to whatever resistance it turned out to have. Otherwise it's a right sod of a job to adjust one.

If you want one calibrated to give easy round numbers as an output, just use a potentiometer across its output. If your display meter has a modern high impedance, this is easy.