04 cadillac cts tach wire

I am attempting to install a remote start on an 04 Cadillac CTS.  Install is all done with the exception of the Tach wire.  The diagrams that I have read say that it is on the ECM.  Most say connector 2 pin 35 and that the wire should be white.  I believe I have found what would be considered the ECM, as it is on the right front of the valve cover.  It has two connectors, but they are not like any I have ever seen.  They have a lock on them and really don't look like something I have normally seen on a GM.  I opened both wiring harnesses and have found a total of 3 white wires between them.  Tested all three-no tach.  Does anyone have any better description or a picture that they could post with a better explaination?  I have put in a lot of starters, but this one totally has me stumped.  Thanks!

I looked at the picture and was indeed in the right place.  I thought I went through every wire in that harness at least 3 times, but I guess I will have to tear into it again and look a 4th time.  At first glance this car doesn't look all that difficult, but has definitely given me my share of headaches.