What's everyone run for a fuel pressure gauge? Every brand I try doesn't work, they all end up at zero after 10 mins of use. There's GOT to be fuel pressure, because the car is still running hours afterwards!

 

Not really much to go on there, but you could, with a mechanical fuel pump, be at nearly 0 psi indicated and have the car run as long as it is pumping enough volume of fuel.

I use a return system and a tank mounted electric fuel pump which stays around 8 psi to the carb, with a cheap liquid filled mechanical Mr. Gasket gauge mounted post regulator and it has been in service at least 10 years.

 

I use a 2 5/8" Jegs gauge, been using it for years and I've checked it with other gauges and it's on the money. The little ones on the fuel logs aren't real accurate.

 

The car will indeed run on almost no indicated pressure, as carburetors work on vacuum and not pressure. As long as fuel is reaching the bowl, the carb will work; if you have tried various gauges and all indicate limited pressure, the most likely case is you have low fuel pressure. I would encourage you to test fuel pressure with a mechanical in line gauge with the engine hot to confirm and address your fuel pump/system based on readings.