I thought about that earlier, but I didn't know if the tach needed to see 12V pulses.  Then again, I also don't know what voltage the tach output of Tracy's unit is.  

Hi Rusty;
        It is a CMOS device that will operate from 5-15VDC, so should work just fine. (maybe...)

S. Todd Bartrim
Turbo 13B
RX-9endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

        "Imagination is more important than knowledge"
                                        -Albert Einstein