when the first zero timing version came out from tekin it was suppose to be equal to the rest of the zero timing speedos but it was not even though it didn't actually have advanced timing in it on a scope, the settings and engergy output was higher then the the rest of the speedos which were close to equal output wise in the "zero" spec settings. tekin fixed it but by then the cat was out that tekin wether by accident or by design could make a setting change that showed on the scope zero timing and still have higher output. which is why I think Rob King as banned them from the list of allowed speedos