so i'm installing this guage, where do i tie in, on the radix correctly?

 

There is a nipple on the back of the manifold, hook it up there.

 

not seeing it............... we got nipples on the blower itself

breather
brakes
bypass valve

and on the intake tube:

pcv and a nipple that's blocked off.

the lower manifold/intercooler ( i think ) has a small brass plug in it, near the rear.

 

josh found nipple,he's good for that **** i guess.

directly behind brass plug.............. thanks,

 

correct.