the place where you got the Dextron should also have a hand pump, buy the big bottles of fluid (5qts) you will need about 8 to 9 to fill the system.
The part thats has broken is the thermocouple for the trans you may have to order a new sensor to fix it.
This part goes into the back side or rear facing fluid line connector that connects to the DS of the transmission and the other end ...



