The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**JQ-72** · 10-10-2003, 08:38 AM

What's the deal with all the tach/vacuum gauges popping up everywhere? Was the vacuum gauge optional on series 10-30? I have several pieces of factory literature on these trucks and I have never seen mention of the vacuum gauge. I have seen 3 or 4 in series 40-60 big trucks. I have heard they were for the heavy duty "hydra-vac" brake set-up on bigger trucks. Any ideas?

Joshua

10-10-2003, 08:38 AM	#1
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,632	vacuum gauge ?? What's the deal with all the tach/vacuum gauges popping up everywhere? Was the vacuum gauge optional on series 10-30? I have several pieces of factory literature on these trucks and I have never seen mention of the vacuum gauge. I have seen 3 or 4 in series 40-60 big trucks. I have heard they were for the heavy duty "hydra-vac" brake set-up on bigger trucks. Any ideas? Joshua