I have a 90 honda civic D15b2. Automatic. And the sensor in my transmission which lights up the gear on my dash, seems to be bad. It works but when its even slghtly cold it won't read the gear when in park, which leaves me sitting because i can't turn the car off or put it back in gear till it senss it. Can someone tell me what this is or how hard it is to fix. Thank you.