what is this???

[Dhos1]

Passenger side of engine bay with a vaccum line attached??

 

[blackazz]

That is for the digital dash boost gauge light.

 

[TurboDave]

for the digital dash boost "lights".

 

[Dhos1]

Do I need it if my dash isnt digital?

 

[blackazz]

No,just cap the line.you don't want any vac leaks.

 

[Heskahoka]

Do I need it if my dash isnt digital?

You do not. In fact, pull it and sell it. Folks seem to be looking for them since they are discontinued.