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That oil pressure is fine. Some LS1's as they get older only have about 20 at idle. That is still ok. 7-10 lbs per 1000 RPM is what is recommended. If the gauge never moves, consider changing the sending unit( a PITA) its located behind the intake manifold on top of the block.
And yes 98 was the only year to have a fully functional temp gauge. The later years were basically an idiot light. The problem was being an all aluminum engine it fluctuates in temp alot. People were bringing their cars in thinking there was something wrong with it. Probably why the new Camaro reads "C Normal H" so they don't have to worry about that again.
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Current cars: 
99 Z28
06 Silverado
14 Silverado |