I went to HomeDepo today and picked up a couple of metal switch plates. I got 2 in case I messed one up. They were only .98c so . . .
Here are the photos of the mount:
Here's one of the white metal (paintable) plates next to my nibbler tool and scratch awl. I basically put the meter on the plate and scratched a line around the base of it.
Then I used the nibbler to eat away the metal back to the line. It took about 10 minutes but I was patient. I might have been able to use a sheet metal blade on my jig saw but that's hard to control. Radio Shack used to sell these nibblers to cut holes in project boxes - don't know if they still do.
Here's the plate post "nibble" - note the two cutouts on each end for the tabs - I just cut these back about 1/32 of an inch, it didn't take much. I then used a grinding wheel on my dremel tool to smooth out the edge - I probably didn't have to do this, it doesn't show under the edge of the meter, but I'm a type A
Test fit before painting. In these photos it looks like the flange around the meter covers part of the screw hole - but that's an artifact of the angle of the picture - in fact it just clears the screw hold perfectly.
Paint job - I used flat black - I think I'm going to repaint with gloss - the flat doesn't match the meter very well but it was all I had laying around the shop. You'll notice the 2 black pan head wood screws I'm going to use to mount this right under my control center. I'll put a photo of that up after I finish the install.
The advantage of using the plate is that the tabs on the meter "click" into the plate really solidly - then you can screw the plate to whatever you wish. It also means you don't have to be a precise in cutting a hole in the cabinet as the plate will cover a world of jagged cuts. The plate is an "oversized" outlet cover by the way. You might get away with a normal sized one but HomeDepo didn't have any in metal.