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  #1  
Old 03-15-2008, 03:15 AM
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Got myself an Economy Gauge (W123)

I pulled it from a 1985 280CE Euro. I know about how some convert it into a boost gauge, but I figure if I were to keep an eye on my boost, I'd just get the real deal VDO gauge. What I'm going to do with this is tee into the vacuum line running into the VCV and have it operate like it would on the gassers. It's purely for eye candy purposes and conversation starters at MB GTGs (say, why does yours have that economy gauge? Does it really work?) After I got it, I noticed the folks at the Pick-A-Part marked the gauge with some yellow paint for warranty purposes. They put the paint on the white backing, I'm hoping that won't affect its operation, will it? Sorry for the blurriness.


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  #2  
Old 03-15-2008, 03:31 AM
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what would doing this achieve? So you can watch your vacuum fluctuate when you give it throttle???
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  #3  
Old 03-15-2008, 04:56 AM
ForcedInduction
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Originally Posted by turbobenz View Post
what would doing this achieve? So you can watch your vacuum fluctuate when you give it throttle???
Exactly. The vacuum moves and works like it would in a g@sser's intake manifold so it will still work as an economy gauge.

Last edited by ForcedInduction; 03-15-2008 at 05:37 AM.
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  #4  
Old 03-15-2008, 06:11 AM
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I always thought those gauges were pointless. As if you need something to tell you how far you've opened the throttle.

But kudos to you for doing something different to your diesel.
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  #5  
Old 03-15-2008, 10:38 AM
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I just recently got one too....Maybe I will do the same thing! I agree it makes for a conversation starter at meetups.
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  #6  
Old 03-15-2008, 11:13 AM
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that aint gonna work, there is NO vacuum in the intake manifold on Diesel engines, the gauge is just going to sit just like it is all the time.

Paul
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  #7  
Old 03-15-2008, 11:16 AM
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Vacuum gauges are good for detecting failed valves. On a gasser they flutter with the inconsistency in vacuum that a bad valve causes. I once bent a pushrod on a Ford straight six and the vacuum gauge picked it up right away.

In this particular instance, I think the vacuum gauge is a great tool for keeping a permanent diagnostic eye on the vacuum system. You'll know your engine is not going to shut off before it actually doesn't shut off.
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  #8  
Old 03-15-2008, 11:21 AM
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Originally Posted by paul900 View Post
that aint gonna work, there is NO vacuum in the intake manifold on Diesel engines, the gauge is just going to sit just like it is all the time.

Paul
most of us know that.. but by t'ing into a vacuum line... you can see how much vacuum the pump is putting out... or with some clever tinkering make it work with the turbo
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  #9  
Old 03-15-2008, 11:22 AM
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Quote:
Originally Posted by kerry View Post
Vacuum gauges are good for detecting failed valves. On a gasser they flutter with the inconsistency in vacuum that a bad valve causes. I once bent a pushrod on a Ford straight six and the vacuum gauge picked it up right away.

In this particular instance, I think the vacuum gauge is a great tool for keeping a permanent diagnostic eye on the vacuum system. You'll know your engine is not going to shut off before it actually doesn't shut off.
I agree. It would seem useful for early diagnosis of vacuum related problems and just give info about the operation of your car. I'm going to put a voltmeter on both of my cars as soon as I get the charging problem solved on the 300D. The more info the better. I just wonder about the operating range on the econ gauge and how much it will move with the vacuum seen at the main line. Is there a big difference compared to the intake on a gasser?
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  #10  
Old 03-15-2008, 11:30 AM
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Isn't the amount of vacuum pretty much the same on our diesels regardless of rpm????
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  #11  
Old 03-15-2008, 11:34 AM
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Quote:
Originally Posted by JimmyL View Post
Isn't the amount of vacuum pretty much the same on our diesels regardless of rpm????

if you put it after the VCV it should act the same as a gasser, if you have your VCV and system tuned correctly
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  #12  
Old 03-15-2008, 11:46 AM
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Originally Posted by lutzTD View Post
if you put it after the VCV it should act the same as a gasser, if you have your VCV and system tuned correctly
So you would in fact be monitoring vac to the tranny, but you would at least maybe see the gauge move I guess??
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  #13  
Old 03-15-2008, 12:51 PM
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Quote:
Originally Posted by TheDon View Post
or with some clever tinkering make it work with the turbo

probably impossible... but extremely cool to make it a boost gauge.
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  #14  
Old 03-15-2008, 02:49 PM
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There is information on this site about converting it to a boost guage. Can't find it right now. Needle gets moved to new position on shaft.
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  #15  
Old 03-15-2008, 02:54 PM
ForcedInduction
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Originally Posted by Mister Byrnzoil View Post
probably impossible... but extremely cool to make it a boost gauge.
Pry the needle off the shaft, install it in the 10 o'clock position, move it over the stop peg and bingo, you have a 5-12psi gauge. It worked for my gauge.
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Got myself an Economy Gauge (W123)-lmn-215000miles.jpg  

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