@gunrunnerjohn posted:So, a universal board would have a spot for a resistor and perhaps a trace that jumpers it out for PS/2 use. Sounds like a pretty easy thing to do.
So are you volunteering? If so, I'll make some caliper measurement of a PS2 tach board and "we" can average the measurements to come up with the dimensions. Like you say, it probably makes sense to design a 2-up board that can be easily cut-sawed-broken in half so you get 6 boards in an OshPark design. Obviously anyone going thru the effort to deal with OshPark is a card-carrying DIY'er (!) and knows how to solder, etc. I figure with Aliexpress pricing for the QRE1113, OshPark, and such you could make MTH tach boards for 50 cents or at most a buck.