gauges with switch and relay

Hi, i am trying to install gauges whitch i could turn on and turn off with a switch. For this i will be using relay. It's a first time when i am making something wiht relays. I what to use it because one gauge needs 10A fuse so 3 gauges 30A fuse and it goes for 30A shwitch. So i decided to use arely that i could use less amperage switch. Here are some schemes of my wiring, could anyone tell me where is correct position of fuses? To use it before switch or before gauge? Any other suggestions, my made mistakes? http://www.freewebs.com/skerdienah/gauges.jpg http://www.freewebs.com/skerdienah/gauges2.jpg Constant 12V is used to save gauges memory. For gauges turn on/off i use switched 12V wire. I made my schemes using this one: http://dsl.torque.net/images/relaycircuit.gif Thanks folks for any help.

Main fuse at the battery (your source) please.

Just common their power & connect to your meter fuse. Don't confuse their connection to a 10A fuse with their consumption - they probably take under 1A combined. It won't matter if you meter fuse isn't 10A - some may be 15A etc. Otherwise to any fuse that is only powered when the ignition is powered.