A few further bits of info needed here really
A 3 pod holder and a boost guage ?
What are your other 2 guages ?
Do you want the 52mm ones ?
And where did you want the pod?
I have 1 pod on my drivers A pillar which is a 3 guage and it fits fine, just goes over the current trim. Was a cheap ebay one to fit 52mm guages, I am using cheap glowshift guages which i have never had a problem with. But they were cheap and i use my boost controller for checking the boost levels anyway.
But you can get those 3 pod ones which replace the head unit or go over the middle of the dash, all easy enough to fit. Just remember you need to run the guage wiring and maybe sensors etc.
I have Boost AFR and voltage in one car and Boost / voltage in the other
I have one like this
http://www.ebay.co.uk/itm/TWIN-2-GA...arts_Vehicles_CarParts_SM&hash=item35a2e20bc0
But i do find it blocks the apillar when turning in, not a huge problem but something to consider