Pursuant to the recommendations of one of the fórum users i decided to use a kitchen thermometer to verify the actual temperature of the radiator in my 1972 240z and found out that the gauge was not measuring correctly. The thermometer marked 160 degrees farenheit while on the gauge marked a Little bit more than half. Based on this fact the solution of the problem now narrows to the following conclusion: 1. The Temp / Oil gauge is not calibrated and maybe even damaged (the oil is not marking c