Don't use RTV on these cars. For the oil level sender, the new gasket should be fine provided the mating surfaces are clean and straight.
However, I would recommend using Hylomar PL-32 or PL-32A. This is the same stuff used on other parts of the engine, such as the timing cover.
However, I would recommend using Hylomar PL-32 or PL-32A. This is the same stuff used on other parts of the engine, such as the timing cover.