Good idea! After trying three different sending units and much searching I found upon a company that specializes in wiring and misc electirical components and they make temp sending units. The company is www.lectriclimited.com. They make claim that todays sending units from GM and after market are generic in nature i.e., designed to cover a wide range of applicatiions and are not very accurate. Anyway they calibrate their sending units for vintage cars and for individual models. I purchased one of their gauges but haven't gotten around to installing. I"ll post results as soon as I do.