[n86121]

On the turbo models there are three easily interchanged fittings on the firewall.

1. Manifold pressure to the MP gauge
Reads MP pressure, ideally.

2. Turbo outlet pressure
Goes to the backside of the fuel pressure indicators - accurate at altitude

My rear was connected instead to fuel flow gauge.
At idle, as intake pressure goes down (vacuum)
the fuel flow (pressure gauge) went up.

3. Fuel injection for cold starts
The little pressure thingy you push squirts fuel into intake
That one goes right to the manifold where the two pipes come together

Its easy to swap those out, and odd things happen.

A. To confirm the injection line, disconnect and press the thingy.
If wet, that one goes to middle of the intakes.

B. To confirm turbo line, just follow it back. Can't remember, but was self apparent.

C. To confirm MP, make sure that line goes to where you want MP takeoff.