Im trying to install the Si cluster in my DX here is the problem. In the middle of the cluster there is a blue connector. Does anyone know what this goes to? on the DX cluster there is a seprate board that it connects to but not on the si cluster... help please?

 

It should be plug and play as long as you swap a cluster from the same year as your car ie 88-89 cluster in an 88-89 car and 90-91 cluster into a 90-91 car. I swapped an si cluster into my dx and it was plug and play. I don't remember there being any extra plugs. Can you take a picture of it?

 

its plug and plat i have a 91dx and i used the cluster with the blue box and my middle plug went in fine