I really need some help on getting this question answered...

Is there any problems using an 88 si intake manifold on a 90 si head and block?

The reason Im asking is because looking at the vacumn diagram for the 90 si intake, it shows a connection from the map sensor to the back side of the manifold.
I do not have that conncetion on my 88 manifold.. right now it is t tapped between the dashpot and first connection located in front of the manifold.

Could this affect my fuel pressure regulator and also throw off my o2 sensor?

Thanks in advance..
Mig