I have a tranny leak (or multiple leaks). One obvious source was the speedo cable. I know there is an O-ring around the speedometer gear housing. This looked pretty good but I changed it anyway. Are there any other seals or O-rings that need to be changed? Is there anything that goes between the cable and the gear housing to prevent leaks (or should a sealer or teflon tape be used on the screw-on ring?). Thanks in advance.