#1 Cylinder seems dead.

The gauge is liquid filled. I will make a video for youtube of the engin .
Okay after that liquid-filled gauge starts heating up it will read incorrectly.. if you had 16 lb of fuel pressure at your carburetor it be gushing out of every orifice and flooding your car and black smoke would be pouring out of the tailpipe... If you could keep it running so that's not it... I don't need a video of it your number one cylinder under the valve cover is your problem. I'm do the 5 screws take it off send make a little cardboard dampener to go around the bottom of your rockers so the oil doesn't spill out onto your exhaust and start the car. Preferably after you've already had it warmed up and it won't be on high idle shooting oil everywhere... observe the number one rockers and make sure they're moving just the same as the others...