If you have average mechanical abilities, DIY! It is really not that hard, and the most difficult part is getting up the courage to drill the exhaust, (drill/tap the Manifold or up-pipes and clamp on pyroprobe) I have done both, I like the drill/tap in the manifold best, cleaner install IMHO) Both function fine though. Cast iron drilles pretty easy, Step drill the manifold, and do not worry about any shavings that may remaing inside there. The exhaust side of the turbo is not tight tolerance and they will pass on through and out the exhaust with no damage.
I also tapped my "Y" on the cold side of the CAC tubing for a more accurate reading of boost pressure. THIS you do want to watch for any shavings. I removed mine, but you could also stuff a rag tightly down into it past where your going to drill, maybe lightly oil the rag, and also vacume out the area before you remove it. Just do what you feel necessary to make sure no shavings enter the motor, those would enter the cylinder thru the intake valve, and probably score the walls!/ubbthreads/images/graemlins/phoney.gif
Trans temp is straight forward, There is a test port on the front drivers side of housing, just above the pan corner. Take out that NPT plug and install the temperature probe for trans. (Some on here have had "Installers" cut their trans lines, and put the sensor there, MOST respected and knowledgeable figures on here say the testport is just fine and dandy for trans temp monitoring! (Good enough for me!)
NOTE, I BELIEVE some probes are longer than others, check for any obstruction inside where the probe could hit..maybe ask when you buy the gauges, and request the shorter one if possible.(I had the short one, no problems)
