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Why are you running 10 - 40 weight oil. You might want to rethink this. As the miles go up the ware on parts goes up. So I would recommend a 5 - 20 or 5 - 30 high mileage oil. If the oil pump is that new and working properly then this will help with the pressure.
Check the oil pressure switch as it's next to the oil filter. You describe a car that hasn't had the oil changed often enough as the dirty oil is eating things up The switch the oil filter and the engine. The oil filter can leak too. These cars seldom leak if the oils is changed regularly (4 times a years or at least every 5000 miles.
This is odd but somewhat normal. This is the way the electronic gauges register. You can try to replace the oil sender to see if it registers different but as long as it shows some increase in pressure when you rev up you should ok. When you put in gear the RPMS on the tach will drop , thus reducing oil pressure. Also,not knowing when you changed the oil last you may just have worn out motor oil.
That's normal, unless it drops below 20 - 25 psi, if the oil is new, the psi can reach 80 psi, when warmed up can drop to 40 psi, try changeing the oil and filter, 10w - 30w should be good.
I can help with problem 1, maybe. Check your oil and oil filter first. If those are okay, then you may need to drop the oil pan and see if the oil pickup has become clogged with debris, if it has, clean it off and put it back together. If that fails, you may need a new oil pump.
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