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wbradley an oil pressure gauge will show you that when the engine is cold, you can reach 7 bars (100 PSI) and you have to take care of your engine when you start at a red lite instead of doing "i'm the best" and reach 9 bars... help your rod bearing shell.
And with an alarm (it will beep when lower than 1 bar), you can prevent an oil leak and an engine damage.
I installed an oil pressure jauge when no one wanted to install an oil pressure jauge in France. Now I m so happy to have one, I dont regret my 100€ : A better investment than the stickers.