So I have a Innovative SSI-4 that I am going to attempt to install this weekend.
http://www.innovatemotorsports.com/products/ssi_4.php

It has a RPM sensor that I want to hook up.. I dont know what kind of ignition sensor my '07 has lol

Here is an exerpt from the SSI-4 instalation manual..

"If the RPM pulse signal is derived from the ignition signal, a multi-spark ignition system
will trigger the measurement multiple times for each pulse. This throws the measurement
off because the SSI-4 does not know if the pulses are for each ignition event (one per
cylinder cycle) or because of multispark. This is specially problematic because the
number of multispark pulses also varies with RPM in a lot of ignition systems. Fortunately
many multispark ignition systems output a tach signal with only one pulse per engine
cycle. But some, notably Ford EDIS systems, output all pulses and therefore may require
a special tach adapter."

Is the 2007 a EDIS system? and if it is.. where do I get a "special tach sensor", or do I actually need one?

 

MSD do one, it's essentially an inductive pickoff which senses the low voltage trigger pulses feeding the coil packs and converts it to the conditioned signal the logger needs.
Got a couple myself as I run a data logger in two vehicles.

 

Ok, so I do have to get a tach adapter?

 

This a good choice?
http://www.jegs.com/webapp/wcs/store...10002_74788_-1


"This Tach adapter will allow you to connect a tachometer, shift light or RPM activated switch to a distributorless ignition system (Including 1999 and newer Ford Mustangs)."

 

Honestly? Don't know. From the tach input spec on a typical logger (11-15v square wave), my electronics training has me believing that the low voltage trigger line on the coil packs would be fine, but if you ask around, nobody wants to commit to saying it's acceptable.
Ijust got fed up with the uncertainty and bought the adaptor figuring it was better to be safe than sorry, especially as they're only around $40-50 compared to the grand my logger cost me.

 

I ordered that one from Jegs.. a little pricey.. but whatever.. just wish I coulda had it for this weekend when I Am going to install my gauges