r.f.b

all right i have a 96 hatch and i did a 99 civic si swap in my car, but now the RPM and MPH dont work at all i checked everything i could check but nothing? also i have a check engine light on pluged in a code reader but it wouldnt read the code for some reason (it was the snap on scan tool) and i also did it the other way by looping a wire into the jumper plug but nothing there also. the car runs fine but just need a little more help from someone with more knowledge