This was not as easy as I had expected. I think I need some more input before I swap these out. Here is what I have so far- please contribute if you can:
Year, Model, Owner, Part #, SP, SP, SP, Reads...
82, D, Craig, 123 542 27 57,
29, 46, 77, ?, not original
82, D, toomany MBZ, 123 542 28 57,
28, 43, 72, ?, not original
83, D, cavaliers16, 123 542
18 57,
26, 47, 76, Fast
84, CD, toomany MBZ, 123 542 28 57,
28, 43, 72, ?
85, D, Jeremy5848, 123 542 27 57,
?, ?, ?, Correctly
So, both Craig and Jeremy have the same speedo. toomany MBZ has speedos with similar part #s but different shift points. Mine is screwy across the board.