That fuel pressure is definitely low. But could be caused by a clogged or partially clogged fuel filter. Or even a clogged pick up sock on the bottom of the fuel pump.
When you changed the tank, did the new one have the plastic cone in the bottom? Sometimes over time they break loose and cause problems with the pump by starving them from getting enough fuel to operate correctly.
Even a clogged vent can cause the problems that you are having, if the tank cant get air into it, the pump cant build any pressure.
In any event, it looks like you are changing the fuel filter and if that doesn't cure it, dropping the tank.
'87 YJ, 4.2L built and bored, 8" of lift, 8.8 rear, AX15/NP 231J, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...