Sure this does show on the outside. Just compare the photo in "Engine Analysis Measurements" (Measurement Concepts Series) with an ordinary 2B67.
For example, the text mentions a Rotational Function Generator position of the (modified) Time/Div switch.
---In TekScopes@yahoogroups.com, <grbosworth@...> wrote :
Does anyone know the specific modification that was done to the 2B67 horizontal sweep plug-in to make it work with the Engine Analyzer that Tektronix offered back in the 1960's and 1970's? Physically, does it show on the outside of the plug-in?