I switched my idiot lights in my 85 pontiac dash (in my 86 el camino) for factory analog gauges. The oil pressure guage has never read more than 20 pounds and I am wondering if it is just a bad gauge (I've seen replacements on ebay) or if something else might be going on. I had someone at Oriley's look up the sending units for both a 4.3 and a V8 and they are the same part number. My new 5.7 engine should be at least 65 pounds of oil pressure. Any thoughts?