turbo speed logging

Ok I am trying to set up my V2 to read/log my Garrett turbo speed sensor. The sensor will output a square wave 5 volt signal at 1/8 the input frequency. The input frequency being one pulse per turbo blade, I have 14 blades so to get turbo rpm I would need : frequency out * 34.29. My question is would I use SWx or ADx? I have tried setting up the calc being:
*CLC-00-096
rpm 0.0 120000.0 .0 "{EXT.SW1} * 34.29"

CALC.TURBO_RPM F096 CLC-00-096 rpm FUEL "TURBO SPEED"

I only copied the data not the headers. I think I am way off. All the other calc pids I have written for the ADx work great. This one's got me. Also does anyone know the slope and offset for a gen 4 1 bar stock map senor, I am using it for measuring turbo inlet kPa. I am sure I can find it, just being lazy.