DAC90a Number Three.

[Tedzed1]

Hi Joe, instead of upping the shunt, you could try a couple of these from Maplins.

http://www.maplin.co.uk/round-mes-type-e10-1977

You need 6V 0.6W, they worked a treat in the one I had,
If you have not got a local Maplins, I could pick you a couple up, and pop them in the post.