[dennyroth]

just got done doing the mach 1 swap in my 2002 mustang, and the speedomter doesnt work, I am using a 02 gt transmission so Im not real sure if this is the problem or not.

I know the speedomter use to work in the mach 1, and I have the wiring harness from a mach 1 transmission
Not real sure, but i know when I was doing the swap there were two male plugs and only one female plug to plug into so not sure if I plugged in the wrong male plug?

 

[wmburns]

It might help if you posted pictures of the plugs. Or how about the size and number of pins?

But I know there are differences noted on the 2003 wiring diagrams that are Mach 1 specific. For example, on the Mach 1, the OSS sensor goes through connector C1045 pin #8. Where as for the GT/V6 the OSS sensor goes through Connector C139 pin #15.

A set of wiring diagram will help you re-pin the connectors to make this work. If interested in getting a set for yourself I maybe able to help. PM if interested.

 

[guy tino]

what wires are you using to run this motor? for 02 you should use 02 gt wireing and ecu and 02 trany harness. other ways are possable , but i have found if you mate the correct year wires and ecu as the car it will be straight forward aplication.

 

[dennyroth]

I ordered the 03-04 mach 1 transmission wiring harness for the 02 transmission that I have, when i go to replace the tranny, ill take pictures of the wiring, I dont know if it could be the speed calibration sensor? not real sure
and the wirirng harness's are from a mach 1, even the dash harness which I didnt need to replace.