Need recommendation for good vacuum gauge for carb tuning

Fuel and Air Systems

  1. 440beep

    440beep FBBO Gold Member FBBO Gold Member

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    I have a hand held vacuum gauge that has to be 30+ years old that I use for setting my idle mixture screws. The gauge needle holds nice and steady (minimal jumping around) when hooked to a vacuum port, but reads 2hg off, but that's ok as I take that into consideration when reading it but at least you can see the needle vibrating around 11hg.

    I bought a new one from a reputable online Mopar speed place but when it's hooked up the needle jumps/vibrates all over the place and is pretty worthless when trying to read it.

    Anybody on here have a suggestion for a good vacuum gauge that holds steady when hooked up? A work colleague recently bought a '72 Cutlass and I'm telling him some necessary tools to get and a vacuum gauge is one; but I want to recommend a good gauge with a needle that holds steady (and I might also buy it too).

    TIA!
    Lee
     
  2. khryslerkid

    khryslerkid FBBO Gold Member FBBO Gold Member

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    Bought mine at NAPA (Actron brand)

    20180329_122030.jpg
     
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    • 65-440

      65-440 Well-Known Member

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      I use the cheapest one available ! Reads the same as my mityvac vacuum pump ...
       
    • PurpleBeeper

      PurpleBeeper Well-Known Member

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      I have one mounted under my dash permanently. I think it's an old Stewart Warner, but other brands are on the market at local parts stores. IF you don't have a "factory car" and have one of those tri-gauges like half the cars I see, take out the volt gauge and put in a vacuum gauge....my 2-cents.
       
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      • 440beep

        440beep FBBO Gold Member FBBO Gold Member

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        yes, but I can't hold the dash gauge in my hand as I'm messing with the idle mixture screws. Need a solid hand held unit like what khrylserkid posted. OR, perhaps just bastardize a good underdash gauge and make it handheld..............hmmm......... you've made me think............:thumbsup:

         
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        • oldbee

          oldbee FBBO Gold Member FBBO Gold Member

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          2# off means little when tuning for highest possible reading.
           
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          • PurpleBeeper

            PurpleBeeper Well-Known Member

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            Good point. I do run in & out of the car a lot while I'm tuning it. I just like the security of having a bunch of gauges in the car so I know immediately if I have a problem. For under the hood, yes, use one like kryslerkid posted.
             
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            • Yatzee

              Yatzee Well-Known Member

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              You can smooth out the gauge by inserting a set screw in the hose just before the gauge. Use a set screw that's just ever such a bit larger than the hose i.d. What you're seeing is basically every cylinder on it's intake stroke. The vacuum will still go by the set screw, just not so violently.
               
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              • 493 Mike

                493 Mike FBBO Gold Member FBBO Gold Member

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                Or a small orifice.
                Mike
                 
              • hunt2elk

                hunt2elk FBBO Gold Member FBBO Gold Member

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                Do you have a pic of that by any chance? Didn't know I could smooth out the needle bouncing.
                 
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                • XCELLR8

                  XCELLR8 Well-Known Member

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                  ^^X2
                   
                • 440beep

                  440beep FBBO Gold Member FBBO Gold Member

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                  This is interesting. Is the set screw hollow inside so air passes through it? Like an oil galley restricter set screw?

                   
                • Ranger16

                  Ranger16 Well-Known Member

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                  I think that's the same one I use. Had it for decades. :thumbsup:
                   
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                  • toolmanmike

                    toolmanmike Moderator Staff Member FBBO Gold Member

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                    I sold MAC Tools for decades. They have a 3 1/2" vac gauge kit (VG3000) VG3000.jpg that is tops. (if you don't mind spending the money.) The NAPA/ Actron shown above is a good one.
                     
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                    • wyrmrider

                      wyrmrider Well-Known Member

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                      xx2 on the small orifice bushing with a smaller hole will dampen
                       
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