Its the size of a standard 2 1/16" gauge.
Could you make one with micro switches I know that it was the size that was the factor for most guys, some of the squirrells out there like to hide the switch.
I suppose this one would just mount in a a pillar guage pod or something like that, so boost egt and dsp5 all anyone needs.
you need to come out with a matching guage set lol