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Time to re-wire


Don Coatney

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My car came equipped with an aftermarket mechanical temperature gauge as pictured below when I bought it. With the re-wire job I am converting to an aftermarket electronic temperature gauge as part of the new aftermarket cluster. This opened up the temperature gauge hole for another gauge. Forum member Jeff Balazs has long been an advocate of dash mounted vacuum gauges so I elected to take his advice and fill the vacancy with a vacuum gauge. I had to look long and hard to fine one that was not a compound gauge with a Boost pressure readout. I found this one on Amazon delivered to my door for $8.99. Thanks for the advice Jeff.

 

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Mine on my 235 six cylinder Chevy with a 390 cfm four barrel has a habit of going from 18 inches to 0 or maybe 5 when I am driving.  Of course I average at most 10 miles to the gallon but then again I drive it 70 to 75 on the highway.  Do you thank that could be the reason for the low reading on the vacuum gauge at speed or just a heavy foot?  I do not seem to spend much time coasting, mine is the old fuel saver with high vacuum in green for good gas mileage and low vacuum in red for poor gas mileage, 18 to 22 in white for idle and 23 to 35 in yellow for coasting. If you try to keep mine in the green range you drive like a little old lady.

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My car came equipped with an aftermarket mechanical temperature gauge as pictured below when I bought it. With the re-wire job I am converting to an aftermarket electronic temperature gauge as part of the new aftermarket cluster. This opened up the temperature gauge hole for another gauge. Forum member Jeff Balazs has long been an advocate of dash mounted vacuum gauges so I elected to take his advice and fill the vacancy with a vacuum gauge. I had to look long and hard to fine one that was not a compound gauge with a Boost pressure readout. I found this one on Amazon delivered to my door for $8.99. Thanks for the advice Jeff.

 

I agree 100%......I have the 1 pictured below. Idles steady @18#.....usually runs around 5# because of my heavy right foot.

 

 

You've answered your own question.  That's why little old ladies, (and me), get much better gas mileage.  Drive a little more gently and your car will last longer and give you much better mileage.

 

That's not as much fun. Mine isn't a DD, so gas mileage isn't that important. :cool:

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What I really like about having a vacuum gauge fitted up permanently is that I can see if something is amiss at a glance. You do need to get familiar to what it should read under specific conditions. Once you have a pretty good sense of what you are looking at then any gross deviation from normal tells you a story. Things like a vacuum leak or a stuck valve are usually fairly apparent.

 

I fitted a fairly expensive oil filled vacuum gauge on my truck. I checked the readings I was getting against two different Mechanics gauges to be certain of the accuracy. When cold and at idle it reads a steady 19.5". Once it has warmed up it idles steady at just a shade below 21". Any significant difference .....particularly a fluctuating reading and I know I have a problem. Similar types of readings can be made under speed and at full load. Again any significant deviation from what you are used to seeing under similar conditions can tell you if something is amiss.

 

Jeff

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