1 have a 1992 prelude w/h22 w/p28 its a race car circle track what is the bare bones needed to run vtec.... i dont have speedo cluster..

 

no need for a speed cluster due to the ecu reads engine load, speed ect.... depending on what prelude model you have you will just need to run the Oil presure switch wire to D6 on your ecu, should be a single wire... then Run VTEC + to A6 and then you need a ground. I've used B2 or A26 i beleive for the ground... here is a link...
http://www.dodo-upgrades.nl/pinoutp06p28p30.htm

You looking for VTS, VTM, and LG1 or 2

 

worked great i did the oil pressure by pass and the vtec would only work for two laps them quit ??again and again