[Lorenfb]

"- Permatunes were installed as OEM equipment from the Porsche factory. Pelican co-owner number two (Tom) had one installed on his 1974 911, brand new from the factory."

1. Porsche used them for only one year and then went back to Bosch.
2. Perma-Tune re-designed the unit (silver vs blue) which resulted in a less
reliable unit, e.g. highly intermittent with temp.
3. Few if any independent shops use Perma-Tunes, since being "burned" by their
poor reliability.

MSD units potentially have less reliability than Bosch because of the increased
component count vs the Bosch unit. Additionally, the multiple sparks have
questional value, i.e. no test data to substantiate their claims. Also, MSD units
are not a direct replacement for the Bosch, i.e. mechanically or electrically.
Many Bosch units have been in use for over 30 years.

There are many sources for rebuilt Bosch units, one of which is Pelican.