[s-cars] Help with a "moisture trap" definition re: boost gauge installation

[Dave Forgie]

Gentlemen:  I have been having an internet "conversation" with an "internationally reknowed" (in his opinion) "20vt tuner" (You can guess who).  The point of the discussion is my understanding about the "moisture trap" (which is isn't) and my contention that you should be able to T a boost gauge anywhere downstream of the "trap".  What is wrong with my statement below?  Comments and corrections appreciated.

Dave F. suggested:

"The 'moisture trap' (which is the wrong name for it) is an analogue to analogue pressure  transducer, i.e. there is a air/fuel mixture pressure "signal" from the intake manifold side of a  fuel resistant diaphram which is translated to an air-only pressure "signal" in the plastic tube  leading to the ECU. The pressure transducer (2.5 BAR or 3 BAR) inside the ECU box is  analogue (pressure) to electrical and translates the analogue pressure signal (can be read  on an analogue gauge) to a millivolt electrical signal (that can be read with a multimeter - as you well know) that is read by the chips in the ECU. (The one thing I don't know is whether  the ECU pressure transducer also creates a digital output from the millivolt pressure  translation or there is something else that does this before the chips).

In any event, to install an analogue pressure gauge, it should be fine to T' off anywhere  downstream of the analogue pressure transducer and before the ECU box. The advantage of  T-ing near the ECU is the analogue pressure signal tube has already gone through the  firewall and into the passenger cabin. "

 Dave F.