the trd site lists that part as having "1/8PT" ports:
https://www.trdparts.jp/interior/meter.html
some light reading on pipe threads suggests that, in japan, PT == BSPT:
https://trimantec.com/blogs/t/thread...guide#PT-Chart
you might try searching for [BS]PT sensors via uk/jp proxies or something.
defi makes some 1/8PT sensors:
https://www.defi-shop.com/installation/sensor/
greddy makes some 1/8PT sensors:
http://www.greddy.com/products/elect...e-accessories/
https://www.shopgreddy.com/collectio...ducts/16401x0x
i have no experience with any of these parts.