i HAVE A 94 CIVIC dx!!! there is a white box underneath the driverside dash they has a single pluge goin to it with about 6 wires??? does anyone know wut this is for? i did and auto to manual swap and i can get me Speedometer to work, i am using an auto ECU and body have any ideas?

 

You need a manual ecu.

 

dont remember exactly but it might be for cruise control or the door switches. not to sure i sold mines a while back. you could get the part number off of it and look it up on the net.
but yeah do get manual ecu

 

Auto ECU will work fine. You'll only get a check engine light. If you convert your ecu, you wont have the CEL on anymore... either way.. it doesnt affect speedo.. My friend handed me the car back with the original unmoded ecu and ran fine. Converted it 2 days later since I don't like yellow lights staring at me all day

 

eveything works fine other then the speedo. but the engine was origanally a auto motor and its the same auto ECU that came with the motor. as far as the CEL it doesnt come on. the only thing wrong with it is my Speedometer, and Its hard to start(first start up after engine cools) then it idels high and then the idel goes up and down constantly.i check the IACV and it seems to be fine. I adjustaded the screw on the throttle body and it dont make a diff.