I had the same problem and thought it was my turbo going. Turned out it was just a TINY air leak where the BOV joins the crossover intake pipe. Would be fine under normal driving but once all the pressurised boost air was flowing it would make a screeching kinda noise out of a tiny hole.
Just had to take it off and put it back on, making sure it sealed properly hahaha.
I wouldn't think it would be a driveshaft issue, if it's ONLY happening as you start boosting.
As for the speedo, take your cluster out (check the tutorial section of the site) and make sure the big thick mechanical cable is plugged into the back of it - without it the speedo and odo won't work at all.