Here is the answer you asked for that you did not want to hear. Ditch the oil pressure gauge with the tube and get one that uses an oil pressure sending unit. GM used electrical oil pressure gauges and so should you. Why? Well after the plastic lines rot and fail behind your dash, you will pump engine oil into your interior. When the line fails under the hood, you may pump oil onto the exhaust manifolds and burn your car down. Yes, the oil pressure gauges with electronic sending units cost $20 bucks more than a pressurized tube of hot engine oil plumbed into your cabin. We know the factory knew what they were doing. There will dozens of folks who will tell you they have never had a problem. And most who have will not come on here and admit it. I have done it twice, once in the original plastic. Then I was told the copper lines never leak. The plastic lines rot and the copper lines flex and eventually fail. If a sending unit fails, just install a new one. Remember if the line fails and you don't burn your car down, then you may just pump all your engine oil onto the road as you drive that long trip. Oops, no oil pressure? Nope, no oil, it ran dry and its time for a new short block.
x2 I had it leaking all over the engine on my test stand (better than the inside of the car) but it f'd up the reading when it leaks. Not something you want to be screwing around with when your doing an initial break in. I'm going electric!
