Yes I am sensing RPM on this board. I do have all inputs and outputs optically isolated from the board and I am using a DC/DC converter. The last few days of thinking about this problem, I am wondering if the switch supplying the signal to the WOT is 'bouncing' It is pretty much a generic micro-switch under the throttle pedal. The main reason I am wondering, is that the On/Off input is the same voltage but through a toggle switch. I sent out a board yesterday to test with a 22uf cap on the WOT trace. Hopefully that will fix the problem.