The bad gauge was acting as a "capacitor" in the fuel circuit allowing pressure to drop momentarily during highest point of fuel demand..(yea a long shot I know).

OR maybe the gauge nipple was screwed into the line too far causing a restriction in the line?

99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..