I use the pro sport premium peak hold gauges find them very accurate I wrot to the company a few years ago begging them to do a metric version few month later they wrote back and said all done great company to deal with they keep their prices down by relying on word of mouth marketing so I speak out any how check em out here
http://prosportgauges.com
I have just read your thread in full now there is a post on inter cooler regarding dust on front part of cooler the answer for that is the oppersite to what was said the dust will indicate that no air is going through there
In regards to your EGT as mentioned it ok at that temp but a better ic and scoop would bring it down also give the girl some boost 15-16 psi will help EGT as well and should help you keep it in 5th longer
Cheers Kimbo