could also see if another module is causing the issue, easiest way i can do that is via the OSE tool that the australian guys built, i "abuse" it's ALDL monitoring capability to see which modules are communicating on a line that is supposed to be open. last time i did this, i found somewhere around 30 packets per second that would have been directed to the trip computer, if the car would have been equipped as such. send enough mode 8 commands to the PCM and it shut it up.