Obd 1????????????????

im guessing you have the 92-95 civic if your car is Vtec then the P28 will fit if its the 92 civic only the wires are in the harness for Vtec if your doing DX the wiring needs to have modifications the D15b comes Vtec or nonVtec that i dont know what your doing. but the P28 will run it just not the best ,, if you are going with the D15b Vtec OBD1 just run the wires for Vtec use your plugs do the pins in the plug. go to www.rywire.com for the pin outs for the OBD1 ECU. The P28 will have to be Chiped to run the H22 the best or it will have codes.