http://www.camskill.co.uk/m19b0s1301p50351/_TOYOTA_OE_GENUINE_PARTS_-_Engine_Coolant_Temperature_Sender_-_Starlet_Turbo_05_1997_onwards
expensive though
haha looks like a dodgy boost guage
have you changed the actual temperature sender its self mate? the plug that comes out of the thermo housing
i think on the glanza the are the triangular grey one. may be mistaken though