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oil pressure gage 1979 930

Engine

Model: 930, Year:1979, Mileage:53,000, Type of use:Street use only
I recently changed the oil on my 1979 930 and now once the engine is warned up at highway speeds the dash gage seems to bounce up and down when the pressure is at the upper levels of the gage. This doens't happen when the engine is cold. I installed WIX high flow filter, could this be the problem or is the sending unit faulty? Engine seems to have pleanty of oil but this eratic gage gives me some concern.I use BradPenn 10-40 wt oil.Thanks for any thoughts you have on this issue.

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