For what it worth, on restore I went back to my factory tach with the RTE upgrade board. It seems just as good as the Super Sun II on the column I dished. My standards may be lower but sure seems to be fine! If using a factory piece make sure you make it compatible to the ignition used!
I used the RTE upgrade as well. It works and moves the needle, probably not all that accurate but I don't really care. I'm happy just to see the thing somewhat functional.
