Japanese · Pronunciation Guide
ta-ka-i, three beats — the ka and i stay separate, so it never rhymes with English "sky."
takai
Two short beats and a bare i, all the same size, with the pitch cresting on ka. This is the same rhythmic template as 若い and 長い — two short beats plus a bare final i — and once it's automatic, a whole family of adjectives falls into place at once.
Listen: 高い
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このレストランは高いです。
Kono resutoran wa takai desu.
This restaurant is expensive.
Listen: このレストランは高いです。
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このレストランは高いです has レストラン beforehand, six morae with two taps, a devoicing-prone su, and a moraic ん. It's much longer in Japanese than English "restaurant," and delivering all six beats before arriving at the three of 高い is what keeps the sentence's rhythm honest.
"ta-KIGH" fuses the last two morae into an English diphthong and adds a stress peak, leaving two beats instead of three. Separate them deliberately. The other thing English adds is aspiration on both the t and the k — put your hand in front of your mouth and soften each release until you feel nothing.