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Since you are in Thailand and not bothered with the EPA / warranty nonsense in the US, you can go for the FP3 from V&H, the PowerVision from DynoJet or the MasterTune by TTS
All three have good reviews and allow for further upgrades of your powertrain.
2018 Softailslim, What Fuel Tuner to use when installing Screaming Eagle Slip ON Mufflers and changing the Air Intake at a later date
From personal experience on two bikes (2016 Iron 883 & 2018 M8 StreetBob) I highly recommend the V&H FuelPak 3.
The procedure couldn't be easier, and having it all done through the app on the smartphone is easy as.
I have just recently finished a 3-week Autotune (3 tanks of gas) and the results and improvements are noticeable.
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom
Slideshow: Killer Custom's latest build relies on styling changes rather than performance upgrades, giving the cruiser an entirely different personality.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.