I started having trouble with my spedometer cable on Saturday and thought it was just coming loose but I checked it out and now I think I need a cable but there are two lengths available, one about 80" and the other I think was 114". I don't want to take the onld one off until I have the new one but I don't know which one to order. I have a 340 4 speed, anybody know for sure which one it is?