Being that the FE3 engine is set up with dual coils on the plugs and no distributor-type setup, I think you'll be looking at something like this...
12V ECU Tachometer Output
If you have a modern ignition system and your ECU (computer) has a dedicated 12V tachometer signal output you can use this to drive the tachometer. Use the SIG 1 (In-Dash Tach) or purple wire (Pedestal Mount Tach) input (see "Signal Hookup" in the instructions).
NOTE: Some ECU outputs are 5V which will not drive the tachometer. If you have a 5V Tachometer signal you can:
Contact us to special order a tachometer that will work with the 5V ECU signal.
Install a Tach Driver (see "Coil Pack or Individual Coils" below).
Here's the link to the FAQs page I pulled that info from: http://www.marshallinstruments.com/faqs/detail.cfm?id=29
I didn't look at other mfgs' tachs. But I suspect others do something similar because everything is going solid state/ECU driven. So it's all becoming a matter of finding the correct wire out of the ECU and tapping into that signal. Makes me laugh because I grew up around motor heads and old school hop ups to squeeze more HP out of the engine. Now you just "chip it" to sup things up. I think it takes all the fun out of tweeking engines. Ah, but I digress...
Hope that helps <img src="/forums/images/graemlins/patriot.gif" alt="" />