These are the three meters i got from SURE ELECTRONICS ebay/china..
I mounted them in a 3-gang specialty switch plate and housed in a LOWES PVC SWITCH BOX.
All of my wiring is in 3/4-inch flexible PVC flexible conduit that taps my battery bank switch connectors.
All wiring in inside the PVC conduit.

I fused my DC wiring with 1 AMP in-line fuses. My DC Current meter is one of those donut type connections. Those wires also have a 1 AMP inline fuse.
I didnt get the 120VAC meter but definitely would use 2-conduct wiring so that nothing would come in contact with the 120VAC.
My meters turned out to be very bright and I had to install a RADIO SHACK toggle switch to turn them off with. Lit up my whole trailer.
My meters have been in use now for about four years... great purchase ...
Roy Ken