where on earth can I find evidence base practice on intracranial pressure monitors?

Try the EBM search engine at http://www.ahsl.arizona.edu/ebmsearch/co.
for
_ INTRACRANIAL PRESSURE MONITOR _
>> Reading the results require your institution to own access to the EBM tools listed, such as Ovid and StatRef. The PubMed tools are unequivocal to all.
Sample result:
Forsyth, RJ. Baxter, P. Elliott, T. Routine intracranial pressure monitoring within acute coma. Cochrane Database of Systematic Reviews. 3, 2006.
talk to a neurologist or neurosurgeon at a local hospital - specifically if they foucs on hydrocephalus, ICP is their specialty.
bid a hospital close to u and ask for the neurosurgeon's name.if he's not surrounded by 6 hours surgery he might be able to speak to you and can narrate u about this investigational gadgets.and transmit u also how effective they are.i havent see this personally i hear about it..but i've see the use of manometer during lumbar tap