Have you mounted in a vacuum/boost gauge?
 

I would like to put one in my car. Where would be a good spot?

To "T" in at the ALDA; you want have to cut any of the Stock Tubing that way.

I don't know about a good place for the Gauge itself.

Is that the round device near the back of the injection pump, that has a covered adjuster on it and a vacuum line coming out of a banjo?

Now to find an enclosure for the gauge and develop a location for it.

See my thread "http://www.peachparts.com/shopforum/diesel-discussion/255906-ashtray-gauges-w124.html." Although this is about the 124, it refers to the 123 in which I had the same gauges, including turbo boost.

Jeremy

re Jeremy
 

Just saw your installation very nice,,, D'oh now I've got a new project. !!!!

Yes agreed a nice installation. What kind of wood/finish is used in the dashboard.

That is Zebrano, the same wood Mercedes used.

Yes.

I bought a boost gauge about 7 years ago. Still on shelf. Car runs well so no drive to get it installed. Especially since there is no good place for the gauge.

I did the ashtray thing on my SL. But that was mainly for the AFR gauge which is useful.
https://dl.dropbox.com/u/54783344/console1.jpg
https://dl.dropbox.com/u/54783344/console2.jpg

I considered doing the ashtray setup (very nice work Jeremy) but I had just swapped in the 92 ash tray from the 190e and its got a much nicer action than the 87 plus its handy for storing quarters. Instead I drilled a 1.5" hole in the switch panel where it had 2 blank spots and installed a 15psi fuel pressure gauge ($8 ebay) to act as a boost gauge. Works beautifully. The only down side is that it tends to vibrate and make a buzzing sound. The solution was to add a cheap fuel filter in line with the hose which dampens the vibrations for the most part. I still get a slight buzz from the gauge at 12psi which is handy at night since the gauge is not lit.
http://i.imgur.com/aqZkg.jpg

I had done some research and noticed that there were some inexpensive pressure gauges and thought why not.

I like the mounting location of yours, more in the line of sight.

Pros put their gauges in place of the center vents :)

Boost on the left, Exhaust pressure on the right

I have a voltmeter and a boost gauge in my 300SD where the ash tray was. From left to right its voltmeter, 12V outlet, Boost :D

Graham
How do you use your AFR gauge. Keep it lean for economy?

My SL is D-Jet. In order to do any kind of tuning, they need a way of analyzing exhaust for %CO. (AFR can be translated to %CO). That is why I installed it initially. It uses a wide band O2 sensor.

I set it more for performance than economy, but with the gauge it is easy to try different settings for both idle and load mixture (different controls)

Those engines sometimes have a hot start problem. The gauge shows that up clearly - mixture goes way lean after car has been sitting hot for a short while. Enriching idle mixture helps overcome that.

Sorry - probably more than you wanted to know :)