I have seen references to replacing the stock tach with an Autometer 3990 tach, but cannot find any description of how it is fitted to the stock housing and wiring. Has anyone done this? I would like to install one in my 1973 240z. Thanks, Victor.

im trying to figure out the same thing,if anyone has any info. i would appreciate it.i see the last one was in 2005.thanks!

Edited March 21, 201411 yr by gearman50