dojj read on

afr gauge
http://www.zeitronix.com/Products/zt2/zt2.htm

and knock link

http://www.thor-racing.co.uk/Knock_L...LNK_KL_KIT.asp

knock box (what i have linked to my logger)

http://www.thor-racing.co.uk/KNOCK_BLOCK_-LNK_KNKB.asp

there u go thatll keep u busy for a min