OFFERING A BRAND NEW VINTAGE 1970'S MARSH TURBO BOOST VACUUM GAUGE 2 1/8" DIAMETER HOUSING BRONZE BRUSHED MOVEMENT ADJUSTABLE NEEDLE CHROME TRIM EASY TO REMOVE TO ZERO OUT NEEDLE. STEEL HOUSING CONSTRUCTION VERY HEAVY TOP QUALITY INSIDE AND OUT. BULB LIGHT SOCKET ON TOP MEASURES 1/2" ID & 5/8" OD OF THE HOLE. PERFECT GAUGE TO USE ON YOUR SUPERCHARGER PROCHARGER POWERDYNE PAXTON VORTECH MCCULLOUGH TURBO BOOST GAUGE.