You might just order a double gauge stack which will also allow you to synchronize your carbs - you need 2 gauges. BTW a leaking petcock hose will create mixture issues as well as it will essentially be leaning the mixture out. You can sometimes detect these leaks by spraying starter fluid into the area of a suspected leak. It will change the RPMs if there is a leak. Once all your leaks are fixed make sure you resynch the carbs and adjust the idle mixture screws
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