1998 Cadillac Deville consumes fluid

I changed the trans fluid and now the trans consumes fluid about 4 quarts in 500 miles, It is not leaking out..
Also the speedometer now does not work... I have not reopened the trans.. I think maybe the speedometer pick up is in the trans pan and I disconnected the connector somehow..
Sometimes the trans will not shift from 1st gear... I shut off the engine and let it sit for 5 minutes or so and I come back and start and go and it shifts through all gears. If it shifts out of 1st gear it will go through all gears...

Thank you