Garuda

difficult to confirm tach gen with picture angle. fact the back of tach missing 2 align tabs look sususpicious there no reason to remove. If you can place the tach over dial then make picture in good light show tach/dial spacing.  

What to look for. Where dial meets inside rim tach, gen tach has like 1mm height before slope starts. rep tach has no  height with slope begin.  does that make sense?

the gen tachy has 2 tabs fit the slots on case. wonder why they were removed?  you just need a new stem and hope all fit together.  

jedi that does not look a gen tachy.  can you post some macro pictures of tachy?  gen tachy has a step at the bottom

tachy+dial looks gen. the tachy is the wrong model for dial.