Did you see
this article? It sounds like you did. It does give a bit of an overview.
You can install the gauge on the line leaving the transmission too - that's how I did mine. I like this idea because I see the temp of the fluid at its hottest. Autometer sells a manifold (glorified Tee-fitting) which allows you to cut your hard trans line and put the sender at that location.
Because I had soft lines going to a stand-alone trans cooler (the cooler is way more important than the gauge IMHO - if you dont have a cooler and have limited funds, get a stacked plate cooler instead!), I have my sending unit Tee'd into the cooler line (this was cheaper and easier than the gauge manifold).
There is reportedly a plugged port in the trans case itself which can be used for a sending unit. I'm not sure if the AODE guys on here have used it - if not, I can give you contact info and pics from a gentleman whom has. I wont recommend this personally because I havent done it. If it works, it would be really slick.
Then of course, there's the drain pan method. I dont like it personally but I'm an oddball.
You would come up with your desired location for the gauge and what kind of pod you want. The most common are pillar pods, cluster bezel pods, column pods, radio plate gauge plates and replacing the dash clock with a dual or triple gauge pod. If you want other gauges, now is the time to get and install them. Once you choose a location, we can explicitly tell you which wires to use for your gauge. It's really quite simple.
Really do consider the trans cooler idea though. You arguably cannot have your trans fluid too cool so if you have a 20K+ GVWR stacked plate cooler, you really should not have trans temp issues. You can always use the TOT (trans temp sensor for the computer) to infer occasional temps if you just want to have an idea.
I dont wanna go on too much because I've already derailed your original thread-intend quite a bit already. There is definitely nothing wrong with having someone install the gauge and/or cooler (don't forget that local mustang club members are actually a neat resource too - in case that's worth considering).
Random thoughts.
Good luck with the decisions
