daverclasper Posted January 24, 2017 Report Share Posted January 24, 2017 Hi folks Are these a useful bit of kit and do what it says on the tin. Also when using it for fuel pressure test for car with a mechanical pump, if engine was turned off. Would the the fuel pressure still be held (as a leak down test, to see if needle valves are seating). Any help great please. Cheers, Dave Link to comment Share on other sites More sharing options...
Pete Lewis Posted January 24, 2017 Report Share Posted January 24, 2017 Vacuum gauge can be an aid to engine setting but if you have all the basic adjustments about right its not going to show you much, if you fit a gauge to measure whats at idle if its tells a poor condition its back to re visit all the basics to make it right used as a economy device can aid keeping the foot off the gas an spoils any fun pressure gauge for fuel pump if you get a well defined spurt from the supply pipe when idling consider it Workable so yes they can be a asset gadget or use the fund to fill the tank and smile Link to comment Share on other sites More sharing options...
dougbgt6 Posted January 25, 2017 Report Share Posted January 25, 2017 I use my vacuum gauge to set both timing and carbs. It works very well and a lot of fun whizzing back and forth in normal driving mode. But I like gauges, the more the better! Link to comment Share on other sites More sharing options...
rogerguzzi Posted January 25, 2017 Report Share Posted January 25, 2017 Me to Roger Link to comment Share on other sites More sharing options...
dougbgt6 Posted January 25, 2017 Report Share Posted January 25, 2017 Speaking of gauges, my ammeter has died. It was a shunt ammeter and is actually a volt meter in disguise! A small high wattage resistance sits in the battery fed and the voltage across the resistance is proportional to the current going through it. The voltmeter is calibrated to read amps, the advantage is you don't need a heavy cable with all the battery amps going through an ammeter, warming up your loom and foot well. But, nobody seems to make them anymore. I have a battery condition gauge but an ammeter tells you the condition of your charging circuit. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted January 29, 2017 Report Share Posted January 29, 2017 Me to Roger Those are nice, but I'd try to get them all the same i.e. matched... looks much more 'factory' if you know what I mean! I managed to find additional Smiths ones for my GT6 - oil pressure and voltmeter - and had to paint the needles orange with Humbrol enamel... worked a treat. Re Doug's post - VDO make / sell shunt ammeters but they're pricey - search eBay! Link to comment Share on other sites More sharing options...
dougbgt6 Posted January 29, 2017 Report Share Posted January 29, 2017 Thanks for that Colin, I'll check them out. Link to comment Share on other sites More sharing options...
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