Sight Glass Style External Fuel Gauge - Nickel Sight Glass, Steel Bung - "Frenched" Style Flush Mount Recessed Bung

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For those of you that would rather flush mount the sight glass on your gas or oil tank…

Simply drill out a 1.75" hole or 2" (For a TRUE Flush Mount look) in your tank and weld away! The extra wide, yet thin .07" thick flange makes installation a breeze as well as blending the bung into the tank minimizing prep time.


  • Nickel Plated Steel Sight Glass - 3/4" male NPT (dryseal) 1-1/8" Hex.
  • Glass - Shatter and Temperature resistant with a unique "Bullseye" pattern.
  • Steel "Frenched" Bung - 3/4" female NPT
  • 1.75" OD (Not including outter Flange)
  • 1.95" overall OD (Including Flange)
  • .70" thick flange so that you can easily blend it into the tank.  
  • Compatible with gas, gasohol and oil.
  • We also offer an External Hose Kit.


  • A universal fit item that should mount to just about any tank or oil bag.
  • Make sure that the you will have room for the bung and sight glass prior to purchase.

Make sure to check out our installation video for a headache free fabrication!

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  • 5
    Love it!!!

    Posted by Blue Ribbon Cycles on 31st Aug 2018

    It still looks good and holds up to all the off-road adventures that this Sporty goes on. Great product!!