Does the GReddy kit come with this?

This is the attachment that's supposed to allow you to send a boost signal from your GReddy electronic boost gauge to the e-Manage so that you can tune for boost instead of throttle/rpm and get rid of that stupid stumble . . .

 

To my knowledge, and after having done a thorough inventory of my GReddy kit, it does not come with this harness.

 

I'm not sure what boost gauge you're speaking of. If you are going to use the Profec E-01 (boost gauge + controller), you need to buy the piggyback cable so that the two systems can share the boost signal. It's $10-$15US most places...