SDS EM-3 Schematic

I'm running a Simple Digital Systems EM-3 on a 600cc motorcycle engine . The car is for the FSAE competition and I have been trying to find the technical specs for this box so I can pull the RPM out puts and use them for a tach. If anyone has any suggestions on where to find them that would be great. Specifically I am looking for the output/input pin numbers and the format at which they are outputted/inputted.
thanks :smile:
-c