Not my problem but this person which I believe a 94 twin turbo Legacy wants to install a boost guage and can't find a good line to T into. I've never even seen a twin turbo and suggested using the line to the wastegate controller. This person tried but the ggauge only shows vacuum readings. Seems strange to me. Anyone with any experience with this know where to splice in the line for the boost guage?
Tee the gauge into any vacuum line going into the manifold. The Blow of valve connected to the intercooler would be fine. If you tee of the secondary turbo's Blow of valve you will not get the desired result, you only see boost pressure when its running & no vacuum information. Teeing of to the waste gate is not a good idea as the computer manipulates this pressure with a solenoid valve and it is not the true boost pressure ( will give you vacuum but not boost pressure until the waste gate is opened by the computer by which time the manifold should be at approx max pressure)
I have teed my gauge at a nipple on the manifold located above (but not directly connected to) the secondary turbo. Hope this helps Mike
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