Here is some info on the Edge from a guy on the TDS. He has a 2001 PSD.
I recently purchased the Edge Evolution CS and got rid of my old Edge EZ module. I'm not going to try and push the CS onto anyone, or steer anyone away from it either, or even really discuss it in this thread, but I like it a lot. It plugs into the diagnostic port and from there you can program your truck (towing, race or extreme, or stock), and then remove it, or you can just leave it plugged in all the time and it constantly monitors lots of things, and acts as a code reader also...which is the main reason I bought it.
One of the items it monitors is TRANS TEMP. This winter, my trans temp gauge from diesel manor hasn't even moved much and was wondering if it had maybe gone defective. The gauge doesn't start until 100 degrees and I suspected that maybe with the cold weather (I don't tow anything in winter) the trans temp wasn't even reaching 100. The Edge CS confirmed this to me as I can watch the temperature rise from whatever the ambient is (20, 25, 30, etc.) to up around and over 100 on the CS before my other old gauge starts to move and compare the two readings side by side. However, I noticed that the reading from the Edge CS gets up to about 120 or so before the needle on my other gauge starts to move at all and in driving it more recently and actually getting my trans temp clear up to 140 or so (according to the CS reading), I've noticed that the Edge CS reading is CONSTANTLY 15 to 20 degrees HIGHER than my old manual gauge reading...so now I'm wondering which one is correct, or if they are BOTH correct as maybe they get their info from different places? I know the test port is likely the true transmission temp as it's plugged right into the trans, but I have no idea where the Edge CS gets it's reading from thru the diagnostic port that is is plugged into under the dash? Anyone have any input on this?
As a sidenote, the other really cool thing the CS has, is a transmission position indicator, as well as a torque converter lockup indicator. This was kind of eye opening to me as I always percieved 5 gear positions (1, 2, 3, 4 and TCL), but in reality the transmission is really upshifting 1, 2, 3, TCL and then 4. Seems that the TCL stays in as it shifts to 4th. I used to think that the final "shift" was the Torque converter locking up. It's not.