I don't think mine will help since analog televisions tend to vary in terms of settings affecting their picture quality based on age and length of use. There are SD 240p calibration screens and test materials available on the 'net to help you if you aren't into just eyeballing it...which is what I did until I get annoyed with whatever relatively minor image issues it has.
If you're looking to get the best picture from your SD consoles, like the Genesis, you need to look into modding them or just buying the appropriate cabling and a SCART RGB-to-component converter, like
this one. For the Genesis, you need to know which model you have and then choose the right SCART cable to interface with the aforementioned converter.