I hooked up my fuel press gauge on my w124 to the main line comming from the tank where it hooks to the fuel distributor and the pressure was off the chart !The gauge only goes up to 150psi and it went all the way around to the zero pin! when the eng is shut down it goes down to 55psi. Then after 15 min it goes down to 45psi.
Did I connect the gauge to the wrong place? Should I connect it to the other side of the fuel distributor where it goes to the fuel press regulator?

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg