E1C / E5Z / E6E–E6F / E9Z ◑ Single-source

Chevrolet · Regular Production Option

Speedometer gear adapter/sleeve/key codes

Years 1970–79 Models 1

Documented applications

Camaro →

• 1970s ◑ Single-source

  internal

This page aggregates every documented appearance of E1C / E5Z / E6E–E6F / E9Z in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.