R34 black box

[TKUSHI_ER34]

Currently doing a FFP install and locating necessary points of vacuum like FPR, brake booster, boost pressure sensor etc etc 

Noticed this little black thing next to the booster that has a Vac line and some connectors

Wondering if anyone can enlighten me on what it is, what it does and do I need hook the vac up or can I cap it off 

 

 

Cheers ??✌

[jmknights93]

Boost sensor for your cluster gauge.

[TKUSHI_ER34]

7 hours ago, jmknights93 said:

Boost sensor for your cluster gauge.

Cheers haha most definitely need that ??