http://www.efi-parts.co.uk/index.php?productID=125

Not the NPT thread, but an option ?

http://www.jti.uk.com/product/engine...rature-sensor/

More expensive, but a combined pressure and temperature sensor. Obviously if it's in the tank though it will be of little use as far as pressure goes.

http://shop.scoobyclinic.com/index.p...product_id=525