Auber EGT+boost gauge. MAP sensor install

[Krazyistkarl]

So I ordered in my auber EGT and digital boost gauge, got the thermocouple and MAP sensor wiring throught the firewall where the transmission shifter linkage (I think) went throught. Got the EGT probe installed in the EGR blanking plate, but I'm not too sure where to install my MAP sensor, post intercooler would be the most acurate, but im not sure if I should instal it in the intercooler piping, or in the intake EGR blanking plate. My only fear with having it in the EGR blanking plate is the sensor being too close to the exhaust manifold.

Is there any other good places to tap into for this sensor?

[Big-Bird]

On the 4M40 equipped L400's most direct read pressure on dial/digital gauges is taken close to the turbo via a "T" that is cut into the small air line that runs a boost pressure 'signal' down to the IP. Easy to do with brass connections and some tubing.

You could put your MAP into a metal intercooler tube and splice that into into the hose between the turbo and the intercooler. That way you get an accurate reading of what the turbo is producing before the air charge gets cooled. If you have metal tubes like I do there are some nice threaded stainless connections that allow you to install ports without welds, these use a rubber O-ring to seal the hole.There is also copper pipe available in the correct diameter so you could theoretically solder a brass connection to the copper and then paint with engine paint, unless you like the 'STEAM PUNK" look.

MISHIMOTO.COM has some variety of rubber parts is this area.

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Here's an example from the VW Jetta forum

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Common confusion with boost sensors and gauges (gotta love WIKIPEDIA!)

MaP sensors measure absolute pressure. Boost sensors or gauges measure the amount of pressure above a set absolute pressure. That set absolute pressure is usually 100 kPa. This is commonly referred to as gauge pressure. Boost pressure is relative to absolute pressure - as one increases or decreases, so does the other. It is a one-to-one relationship with an offset of -100 kPa for boost pressure. Thus a MaP sensor will always read 100 kPa more than a boost sensor measuring the same conditions. A MaP sensor will never display a negative reading because it is measuring absolute pressure, where zero is the total absence of pressure (it is possible to have conditions where negative absolute pressure can be observed, but none of those conditions occur in the air intake of an internal combustion engine[citation needed]). Boost sensors can display negative readings, indicating vacuum or suction (a condition of lower pressure than the surrounding atmosphere). In forced induction engines (supercharged or turbocharged), a negative boost reading indicates that the engine is drawing air faster than it is being supplied, creating suction. This is often called vacuum pressure when referring to internal combustion engines. In short: most boost sensors will read 100 kPa less than a MaP sensor reads. One can convert boost to MaP by adding 100 kPa. One can convert from MaP to boost by subtracting 100 kPa.

[Krazyistkarl]

At this time I'm just running the factory piping with tie wraps every inch, might look at upgrading later.
this sensor has orange rubber which can come off and behind it there's a barb, I'll measure the diameter tomorrow at work. The rubber would push in nicely into the EGR blanking plate, maybe I'll just make a secondary heat shield to protect the sensor. Do you happen to know what the ID is of the boost lines if I go with the T in route, brass Ts of all sorts at work.
What is a more beneficial reading, although probably a little negligible, what the turbo is producing (pre intercooler) or what the engine is actually seeing (post intercooler)?
With the Auber gauge you can set the parameters so the MAP sensor outputs O PSI.

[stever1000]

I would love to see pictures when youre finished!