Build Sheet?

[king80vette]

I have a 1980 built in Nov 1979, serial #07077. The build sheet has a few items on it that I do not undersand. They are as follows:
D1A speedo gear
E5Z less adapter
E6E sleeve-speedo
E9Z less key-spoo
Does anyone know what these are? It has a 175mph speedo in it that I guess is not oringinal. Because all 1980 had an 85mph speedo.

[JohnZ]

Those are "scheduling options" the computer uses to specify the correct speedo gear on the build sheet based on tire size, axle ratio, and transmission. They have nothing to do with the speedo head itself, as they're all calibrated the same for standard cable revolutions per mile - the speedo gears make the difference in cable revs per mile for mechanical speedos or in impulses per mile for electronic speedos.

[king80vette]

Thanks for the info.