Just fixed a 2006 Jetta with a bunk oil pressure warning and loss of tach with this exact part. A previous company already swapped the engine once for over $5k when an oil light came on!!! Engine was probably fine. Data showed the actuator was reading 60% no matter the position of the rod. The thing was shorting out internally and causing the computer to toss an oil light and kill the tach. I can't explain why, but the short caused the voltage to go somewhere else and cause the tach/oil light issue. I could consistently reproduce the issue by plugging the VNT actuator back in. 150k mile vehicle.
We just put one in from ID parts. It was an open box and I think they are the ones that source the fabbed bracket and put it on the actuator and then put it back in the box. It was a Borg Warner box.
Anyways...the rod is a little different length, so the counting threads method doesn't work to set it up. I went by an eyeball method of lining up the adjustment bolts relative to the mounting hole, but when I put installed it, the data showed I was at 20% engine off. I readjusted so the data showed 0% engine off. THEN I noticed it was swinging only to 80% max with max vacuum. Applied with my non calibrated mouth! I had to adjust the stop screw to get it to go to 100% on the data.
It fixed the problem of the tach and oil light, but still shaking out a no power issue. Vehicle has a P0408 code and won't boost. Wont rev over 2k at idle either. Starts smoking and knocking. I think it's in limp mode, but with the vacuum to the NEW VNT removed. You can drive it, but just with no boost.
Will a P0408 cause the car to be undriveable/limp mode? Gotta fix the EGR potentiometer still. I really hope the vehicle will finally get its boost back once this final code is gone.
http://forums.tdiclub.com/showthread.php?t=458709
Oh, and it ended up not being that hard to swap it. Just used a 10mm universal joint socket. Electrical tape on the OUTSIDE to keep the flex down. Electrical tape on the INSIDE of the socket to hold the bolt in place when starting it. It's a good trick! I use it on spark plug sockets that have lost the rubber, or any socket that I wanna hold the bolt in place.