Ah, yes. Cal Omega made a whole line of early video arcade (ie, no money-gambling) games.
Most ran on what they called their "903" main board, connected to their own proprietary backplane
board which included the power supply elements, connected to whatever pushbuttons/joysticks were
required, and to an RGB monitor, usually a 13".
Only later did they enter the gambling machine market, through the CEI name, using the 904 board (which is
just the 903 with more history memory for betting disputes)
Software is in ROM packages, with a 2-digit number identifying the general line, and a single digit representing
the specific version or upgrade. The Pixels game first came out as 14.5 in 1982, subsequently replaced by
18.3, 18.5, and 18.6. Your game is one of these 3 latter, probably 18.6.
The game description is:
A 'match the people by color and number' game. Player has the chance to exchange up to 5 people (Pixels) per game. The 'bounced' Pixels disappear and new Pixels march on with the sounds of tramping feet. If winning combinations are obtained, then comes the option of playing 'Double' where the player can double his skill points. When the player has a win, he has 2 choices. He may keep his win with the 'Take' button or try to double it with the 'Double' button. If 'Double' is selected, a random display of Male and Female Pixels flash on the screen. The player then presses either the 'Male' or 'Female' button. When the action stops, if the Pixel on the screen matches the button presses, he wins. Sound familiar?
The chances of your finding a machine is extremely low, although you should keep looking.
To make one you'd need board, a backplane, the right pushbuttons, and some insane wire harnessing, for
which there exist no known schematics.
NLG may be helpful, but we are mostly slot machines. You'll have better luck and response on the Arcade sites & forums.
If you just want to enjoy the game, and perhaps others of it's age, I would strongly recommend the MAME
route: Multiple Arcade Machine Emulator. This is a software setup that runs on PC, and uses the original game
ROM data downloaded for use with a MAME setup. The particular set you want is labeled comg186, and is available free in several places.
Best of luck to you; Cal Omega made a lot of neat stuff, much of which is still very popular, especially in the MAME game.