Factory tach is definately a rare option, but not too hard to find, I have two in my shed.
Some of these are rare, some are just getting damn near hard to locate now.
Levis editions
Actual 1981 anniversary cj's that are also golden eagle jeeps
Warn Overdrives
V8 in a CJ8
J10 tugs
Semi Floating 5 lug D60 rears from J20 trucks <- very hard to find, very desirable, only years were 74-76 I believe