123ignition and Oem Tachometer - any issues?

I have had a few ask if there is any problem running the 123ignition with the old tachometer.

To my knowledge there is no problem. However, if you do need to have your tachometer repaired there are two  companies that do the conversions to add modern electronics so they will work with the modern ignitions of today.  I had mine repaired in 2006 by JDO in the UK. I can't say enough good about them and their service.

They are:  http://www.jdo1.com/ and http://www.nisonger.com/

If you have any issues and fixes post them here.