You can buy a digital multimeter with a 10 amp current range for cheaper than a discrete meter. Discrete meter are about $60.00 each less the current shunt. Plus you don't have to make a mount for it. Just put the DVM in series with you positive output jack.
http://www.radioshack.com/product.as...%5Fid=22%2D813
22-813 DVM on sale for 20.00.