Not sure what is in the "flush kit", but you don't really need anything fancy. A squeeze bottle (like one a chef would use to apply the raspberry drizzle to your chocolate torte...) and a blow gun for your air compressor are all that is really needed. Mineral spirits or lacquer thinner make reasonable flushes - $3-$7/gallon at your local big box hardware store. A flush gun which can be filled and then pressurized is convenient, but not absolutely necessary.

Interdynamics is a low-end brand of guages, I have not had the best experiences with their products. For similar money you should be able to get a set of Mastercool or Robinair guages - much better qaulity and performance. Check the websites at http://www.acsource.com or http://www.ackits.com.

I would recommend leak checking the system in your CD before assuming the compressor needs seals. At its age just about any component could be bad - leaky hoses, stone in the condenser, etc.

- JimY