code 1 is your oxygen content (most likely o2 sensor). this has nothing to do w/ speed sensor. for you speed sensor, there should be a "C" clip that holds the cable in the tranny. to lock the speed sensor, i found it easiest to put the clip on the transmission speed sensor first, then try to put the cable in till it is locked in. try to pull the cable out to see if it is locked. don't try to rip it out but see if you can get some tension on the cable. kinda hard to explain how much tension to pull but once you get it right, you can kinda feel it when it's locked in. if it isn't locked in try closing the c clip a little and press the cable harder into the tranny... it should eventually lock.
HTH