I have a 66' 6 cyl and the oil gage shows no pressure. I replaced the oil sending unit but still no pressure showing on the gage. So I figure either the gage is bad or I have no pressure. I don't really want to take the gage out now. I took the value cover off and there was some small drops of oil coming from the rocker arm. Not sure if this is normal. Is there a easy way to check to see if the engine has sufficient oil pressure?