Not the yellow/brown coolant temperature sensor but the slightly smaller black one next to it (on the water pipes/front of the engine)

 

*mines brittle as arse and has come apart but figured before I re-solder/replace it, I should ask if it actually does anything important

 

any ideas?

Its the water temp sensor for the gauge is it not?

That'll be it then, cheers bud

theres two on there a injector style brown one, which is the ecu temp sensor and a black spade connector that is for the dash gauge.

It's all corroded inside but I reckon it'll be easy enough to repair

It's all corroded inside but I reckon it'll be easy enough to repair

 

Just wrap plumbers PTF tape around the sensor thread before you fit...gives it a nice snug leak free fit:)

The sensors are pretty generic and cheap in all fairness.