I had a 90hp TLDI on my previous and also bought the factory manual which gave all the information to read fault codes and engine hours thru the tach. Now I'm going to put a 50hp TLDI with a tiller handle on the boat I'm now building. I'm assuming the tiller doesn't have a tach to go with it, so will I still be able to read any codes, engine hours or diagnostics with this motor? Also, how will I know if I'm propped right without a tach?