I have Petronix in my cars and have never had any issues, since 2016, 70 Boss, 2017 66 Mustang, 2017 67 GT K code, still working, but my 67 Shelby with points will not rev over 3000....the needle stops.
I can believe there is metallic dust within it, so I will entertain that idea, thus who is the tach tech with the open mind to have found that?