Aftermarket dash Guages?

My guages are not working all that great, and I hate electric guages anyways, and my clock is not working. So, what I want to do is replace all 3 guages with aftermarket ones, a fuel level, an oil pressure, and a temp guage. I was told there are some specific aftermarket ones that fit nicely in the factory openiings. What size guages will I need? Also, since I'm wanting all mechanical guages, I need to know the correct sizes for the fittings on the engine. I bought a tripple guage pod with only a couple common sized adapters for the fittings and was unable to use it since the fittings on my engine were not compatable. So I will need to get the correct fittings also. What are you reccomendations as to size and the engine fittings? Thanks!