Your Vision Trimax crankset can either be BB30 or PF86. If it’s BB30 you can install the Stages FSA SL-K BB30 Power Meter.
Please note, these power meters attach a sensor to the inside of the left crank arm. On some bikes, there is not enough room between the left crank arm and the chainstay for the sensor to clear the frame. Therefore, you should make sure you have at least 10 mm of clearance for Stages power meters. Also, please make sure that you don’t have a bottom bracket mounted rear brake (used on some aero and TT bikes). Please refer to the image below.
If your crankset is PF86, unfortunately there is not a Stages power meter that will fit. You would therefore either have to change your crankset for one that is power meter compatible, or go with power meter pedals, which can bolt on to any crankset.