It's amazing what a thorough cleaning can do for E-Type instruments. This kit includes inner and outer O-rings for the small instruments (there is an O-ring to seal the glass and one to cushion the assembly to the dash panel) and outer O-rings for the large instruments. (It does not include parts for the Series II or III clock or the inner O-rings for the large instruments.) Also included is a tube of dielectric grease. After you cleaned all the wire connections to "tight and bright" status, use a dab on each connection to ward off oxidation and corrosion.