I have a 1990 civic DX hatch, its got a d16z6 swaped into it. When I baught the car, there was no vtec pressure switch, so I got one and put it in. Also the car was wired to run a pm6 ecu, I took that out and got a p28 with an obd0-obd1 jumper. The junper did not come with instructions so I looked and looked, and got it to where the enine will turn over but will not start. I believe it is due to the logic ground is not atatched. I am unclear about whete this wire goes, I can add pics if it will help. Just please someone help. This car is my daily but has been down for almost 2 months. If someone has a diagram for a 1990 Honda Civic DX hatchback, & a wiring diagram for a p28 VTEC ECU, I would be very gratefull.