rear main seal replacement 73 Dart 318 V8

UPDATE even though the oil pressure sensor was leaking, it was not the only leak because I continued to get spots on the ground under the bell housing. (it was oil not transmission fluid). So, using advice from this thread and youtube videos, I changed the rear main seal and the pan gasket recently. Thank you to all who responded. It was a big job but I did not have difficulty removing the old rope seal. BUT I'm still getting spots on the ground in the same place. The back of the engine is oily. Next step is valve cover gaskets? What about where the distributor mount? Can that leak?