Vaccum Gauge

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I had a 1979 Cadillac Seville, that had "fuel economy" lights in the instrument panel. Two little lights, orange and green. They were simply wired to a vacuum switch. High vacuum > green light. Low vacuum > orange light. For a driver that has a heavy foot, they were helpful.

Joe B
 
I have a vacuum gauge built into my tune up station. I hooked it up the car and had trouble reading it and I had a chart to compare it to. But, what I did find out is that the engine is relatively healthy and a solid performer. Nothing to out of the ordinary.

Mike
 
I have a Stewart Warner Motor Minder, dial is color coded and pretty self explanatory as long as the needle is steady. If the needle is not steady a vacuum gauge can show many other issues.

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I look at it as creating tomorrow’s problem. Why do you want it or better still why do you think you need it?
 
Patrick L. said:
Is it worth installing one ? No, JMHO.
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Probably not. I had a NOS SW Motor Minder and an empty hole. Cost, not much.

McMimmcs said:
I look at it as creating tomorrow’s problem. Why do you want it or better still why do you think you need it?
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I don't see how installing a vacuum gauge can create a problem. Your other questions aren't worth my time answering again.

denis4x4 said:
I run one in my hot rod A and despite the naysayers, I find it a great tuning tool.
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I totally agree, altho that is not the main reason I installed my Motor Minder. But I can monitor and to a certain extent, optimize how my engine is running while driving
 
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Y-Blockhead said:
Probably not. I had a NOS SW Motor Minder and an empty hole. Cost, not much.



I don't see how installing a vacuum gauge can create a problem. Your other questions aren't worth my time answering again.



I totally agree, altho that is not the main reason I installed my Motor Minder. But I can monitor and to a certain extent, optimize how my engine is running while driving
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Thank you for the very courteous response! It shows character!!
 
Y-Blockhead said:
I have a Stewart Warner Motor Minder, dial is color coded and pretty self explanatory as long as the needle is steady. If the needle is not steady a vacuum gauge can show many other issues.

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that chart is the best ive found across the web. holds true for any engine any year (altho im not sure what a super modern car with variable valve timing and all sorts of fun trickery would show)

print it off on a full sheet of paper and keep it in your toolbox!
 
For in shop testing it can be a good tool if, used with the chart. On the road the vacuum gauge won’t show much. You need to pay attention to the gauge to get good information Kind of tough to do while driving.
 
A vacuum gauge can be a good diagnostic tool. But it really really hard to watch if its attached to the dash panel when trying to adjust the carburetor.
 
I'm planning to install a vacuum gauge once I get the car sorted. I think a vacuum gauge is one of those diagnostic tools that you learn to read over time, based on your specific knowledge of your car and what readings you get under different conditions.

It's also true that we have limited space for gauges, both on the console and in your field of view, so you should think about whether it's more important to have this than, say, a temp gauge, a tach, oil pressure, etc.
 
I added a Hastings gauge to the dash just because it was too cool a piece to not display, and does work althoughfaded, fit perfectly below the clock that only works some of the time.
 

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Gee, I hurt someones feelings. Someone I wasn't even responding to.



And I thought post #7 explained my thoughts. Its your car, we still live in a semi-free country, so you can do whatever you want.
 
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