What should I be looking at first when my pressure gauge jumps to max (3) when I start the car? I know alot of MB do this, but why? Should I start by checking the sender unit or the gauge? Is these really a problem or I'm I making something out of nothing.

Any help would be great.
Thanks

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Professional greasecar installer
Austin TX


98 Jetta TDI with grease car kit + veg-therm (totaled)
87 MB 300SDL running on B99 / greasecar kit + 30 fphe
www.austingreaseguys.com