I have a Ultima 6 speed transmission for my build. I am using a Dakota Digital bar mount speedo with their speedo sensor. The instructions for the speedo sensor say to use a spacer supplied with the transmission for the sensor. Mine did not come with a spacer, also the Ultima has the sensor in a different place than stock. So, do I need one and if so where could i get one? Also, the sensor has an o ring on it about halfway down on the part that slides into the transmission. I could not get it to go in past the o ring? Do I just need to put a little assembly lube on it and push harder? Thanks.