This morning I got to thinking that all I really need to do is divide the 12pulse/rev high resolution signal from the EC2 by 3, then a tach set for an 8 cylinder, 4 stroke should read correctly. So after a little research, I ordered a NTE4526B programmable divide-by-"N" 4-bit binary counter. So long as I don't need to do any signal conditioning, I should be able to solder this to a small piece of breadboard, with jumpers on the appropriate pins and leads, and it should work great.

Hi Todd,

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.   I’ll go out on a limb here and state definitively, that either it will work, or it won’t :-) 

Rusty