ECM(for ECT) Diagram

[primo537]

OK.
So i finally have a diagram of the ECT temp sensor going to the ECM.
Correct me if I'm reading this wrong, In the picture the G2 is the ect sensor and on the sensor are 4 terminals.

terminal 1 - going to ECM
terminal 2 - going to the instrument cluster?
terminal 3 - going to ground?
terminal 4 - going to ground?

My question is:

Can I just ground terminal 3 and 4 to a bolt or something that is outside the ECM module?

Thanks

[KevinA41.8T]

in this diagram its impossible to know where 2 and three are going. you need the whole wiring diagram. ill look it up when i find some motivation.