You don't need the liquid filled for fuel press at the carb. The autometer fuel press gauges have had a lot of complaints on their life, or lack there of.
Any 0-15 will really do, Holley, Mr.Gasket, etc.. I just switched yesterday to a Russell Plumbing from a Rusting 2 year old Holley gauge. I got caught in a rain shower and thats all it took to start rusting.
Russell PN RUS-650350
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1