Can You Find The Hidden Thermometer?

Today's puzzle is another by the brilliant apiyo... all the rules are normal but how is there enough information to allow this sudoku to have a unique solution?! You can the puzzle here:

https://app.crackingthecryptic.com/sudoku/Dqjhn2j4mP

Rules:
Normal sudoku rules apply. Cells separated by a knight’s move (in chess) cannot contain the same digit. The digits on an arrow path add to the digit in the arrow's circled cell. Digits along a thermometer must increase from the bulb end. A clue outside the grid indicates the sum of the digits along its diagonal.

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You can play our brand new Groundhog Day sudoku challenge (and many others) on Patreon here:

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Scott Strosahl's new sudoku challenge is coming on 14 February. The first correct solution we receive will have the chance to test our brand new sudoku hunt, which will be released on 1 March!
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Видео Can You Find The Hidden Thermometer? канала Cracking The Cryptic