I just hooked up a boost guage on my GTS. I spliced into the line going to the Vec2 for the vacum/boost signal to the map sensor for the guage (electric guage). Reads boost great, but at idle I get a zero reading for vacum. Steady cruise vacum reads ok but not at idle. Also, there only seems to be a tiny bit of vacum from the line at all. The line originates from the ****** that came on the Roe intake by the by-pass valve. What am I missing?