Joerg - That steady high oil pressure will surely keep the original 0-30psi gauge "pegged", if it's still functional. If you want to do away with the extra dangling oil pressure gauge, you could order a replacement stock style gauge with a 0-60psi range from many of our vendors.

I recently did just that to go along with my 261 upgrade. I purchased my gauge from Jim Carter - 1949-1953 NOS (GM Original New Old ...e Rebuilt Chevrolet and GMC Pickup Truck, and it's a perfect replacement in the original cluster. Unfortunately it looks like they are now out of stock. frown

You might try sourcing one from Bill's Truck Shop. See the item marked in red in the attached screenshot from their catalog. It does indicate it fits 50-53 models, but the color scheme shown in your picture above matches the one indicated.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)