R34 Plug Identification

[BOLGE]

Hi All,

putting the engine back together and everything is perfect except have this plug left over..

any ideas what it is for and where it goes?

Is on cold side under the intake plenum

*note not a stock plug, as everything has been modified

Cheers

[Duncan]

Despite the level up question, actually I do know what that is....it is a pressure sender wire. 

So check out around the oil filter for an oil pressure sender, or maybe fuel pressure near the filter or on the engine. Possibly but less likely coolant pressure sensor because they tend to be combined temp/pressure senders if you have one. Could also be brake pressure (in a brake line somewhere pre ABS) but maybe I'm the only one that has that on a skyline.