What is that plug

[Keven]

Hi id like to know what is that hole for on the first pic
. the sec9nd one is the sensor i guess that goes in there but is it really??

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[Keven]

Ok my question about the hole wasnt really clear haha sorry.. so yeah the hole between the 1st and 2nd header exit

 

[sntrym]

temp sending unit for the instrument cluster. There are two on the TBI motors - one on the top of the manifold for the computer, one in the head for the instrument cluster.

 

[Keven]

Thanks best complete answer i could ask for