One of the nicest fuel injection retrofits ever! Good work. Is that aircon I see?
There is the ECU coolant temperature sensor (typical Nissan fuel injection type)

This was on the stock EGI manifold near the last runner. Same as the 280Z/280ZX unit
some later 1970s-1980s head have a sensor boss here

There is the temp sender for dash Temp -- EGI used same one as Datsun 1200 and regular B310 Sunny

And a cooling temp sensor (not part of a stock EGI motor) for example this was used on some B310 with electric cooling fan -- fitted to the lower radiator hose
