[RETed]

No problem using the fittings off the back (or the front) of the UIM.
I don't remember which one was which, but on the front of the UIM, the top and bottom fittings see vacuum - the middle does not.
In fact, if using a boost sensor or boost gauge, it's better to use those, cause they take vacuum off the surge tank; there is less chance of pulsations from the alternating front and rear rotors.

I dunno if Mazda still carries those pills, but I didn't bother with them.
The pill is to keep spikes from getting to the boost sensor, so the stock ECU doesn't trigger the over-boost fuel-cut unnecessarily.
If you have an FCD (or some way to defeat the over-boost fuel-cut), then this is not really necessary.


-Ted