My oil pressure sender is a t-piece off the back of the OEM sensor. (near the top of the block behind the head on the left as you're looking at the engine).
http://www.ebay.co.uk/itm/ACCORD-CI...45953?fits=Car+Make:Honda&hash=item1c6c343881
My oil temp is an inline jobby that fits on the filter relocation line.
http://www.ebay.co.uk/itm/16mm-5-8-...DER-MLR-ATB-/401175648301?hash=item5d67ee982d