Ok man, a little delay, I return to my city tomorrow and will be take and post some photos of the gadget.

If I remember right, the sensor was a bit fat, I use a dremel (small hand drill) with a small round stone on the hole for opening it a bit without touching the upper side (for screw the probe). By now, if I want to extract the probe from the engine, it will be hard work.

Also, my gauge has a error of 3 celsius degrees (checked versus a cook thermometer on the entry of the radiator). I´m not sure if the error are intrinsec to the japanesse gauge of if the sensor is a bit upper from the original position (3 degrees are negigible on the practice).

Happy volving,

Joaquin