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Old 07-10-2008, 04:02 PM   #11 (permalink)
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Join Date: Dec 2007
Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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Johnny Mullet -

Originally Posted by Johnny Mullet View Post
Wow. The old vacuum gauge I was using was an older one offered by JC Whitney and it did not even have a number scale on it, just a green "Economy" and a red "Power" display in it. I had no issues with it after 10 years of use in multiple vehicles until the needle fell off.
I ordered a couple of these last week and swapped one of them in :
Here is a vacuum gauge from the 1970's that did a similar thing to your speedometer suggestion :

MILEAGE MONITOR (vacuum gauge)
Auto Vacume gauge (vacuum gage) - Save gas and your engine
I got more than one because they're cheap and I want to be able to offer the option to my friends and family if they get the hyper/ecomodding/miling bug. The fellow I bought them from was also very nice. I think it is more accurate than the original one I got, but it also has an error. It is reading at the upper boundary of the "idle" zone when I am idling. As you can see in the above picture, the "off position" of the red needle is not in the white/zero area. That's what mine looks like when the engine is off. Since I have more than one, I was able to compare them. The other one I have is in the "off zone". Sooooooooooooooo, I plan to swap in the "accurate" one and see if I can turn the dial/background of the other one so that it is also reading accurately. This is actually stuff I like to do, i.e. get cheapy things and make them work better.

I still like the cheapy JC-Whitney one I originally got because the dial is more responsive (270 degrees versus less than 90 degrees). I might make my own custom "dial backing" if I have enough time to recalibrate/remap against a professional vacuum gauge.

Even when it's "broken", I am happy, because I learn something, .



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