Arcade game panel meter

This is a mounting block for a volt/current meter for my video arcade machine. Video arcade machines generally have a power supply that provides +12 volts, + 5 volts, -5 volts, Ground... etc... The most important voltage of all is the +5 volts as this is responsible for all the logic components on the main CPU board, some game boards can be very fussy about the accuracy of this voltage and when changing main boards in a cabinet you sometimes have to recalibrate your +5 volt rail if a particular board draws significantly more or less current than the last one you took out. This also depends on the quality of the power supply as to weather it will fluctuate from board to board. Anyway I was sick of having to pull out the multi-meter every time I wanted to change boards so I decided to mount a dedicated volt meter to the power supply so I could easily check and adjust my voltage whenever changing boards. I searched Ebay for a meter and found a cheap panel meter that does both voltage and