As title says
MY99 STI 5 Type-R

Any body?
Also would like an oil pressure too

Gauges (http://www.ostadal.pwp.blueyonder.co.uk/car_mods_gauges.htm)

Theres some good info there, cheers!

Where would be the best place for me to get some gauges from? (Oil temp. Oil Pressure)

Try the usual outlets such as:

Zen Cart!, The Art of E-commerce (http://www.gaugeplace.co.uk/zen/)
Scoobyparts Ltd Gauges & Pods (http://www.scoobyparts.co.uk/acatalog/Gauges_&_Pods.html)
styling defi (http://www.scoobyclinic.com/stylinginterior_defi.htm)
http://www.scoobyworld.co.uk/catalog/product_info.php?Path=0_68&products_id=1310&osCsid=5c88024442b6719c2bae4efa247fcbf6

Forgot to say you can install oil pressure and temp senders via a sandwich plate on the oil filter.
Personally I did the above method and fitted the temp in the bung above the No3 Cylinder and replaced the OEM pressure sender under the alternator.

Yea, think that is the way id doo it too.