Setup Tentacle with Alexa Mini:
- Set camera and Tentacle SYNC E or ORIGINAL timecode generator to the same frame rate
- Synchronize your Tentacle device, so it's outputting timecode (Green Mode)
- Set the Tentacle's Output Volume > Line
- Set the camera menu:
- TC > Options > Source > Ext. LTC
- Mode > Free Run
- Generator > Regen
- Connect the Tentacle to the TC input on the back to the camera body
- Use this cable Tentacle to Alexa Mini cable
For more info about the Tentacle Sync Setup, please check here 
ALEXA Mini LF:
The Arri Alexa Mini LF has the same Timecode input with a LEMO 5-pin connector as the Alexa Mini, but the angle or our Alexa Mini adapter cable is not compatible with the design of the Alexa Mini LF. We recommend to use this Tentacle to LEMO 5-pin cable instead.