Speedometer and Tachometer not working

Ok.....I found it on the tranny housing, removed it, and nobody can test it to see if it works or not. I did not want to buy the new part without knowing if that was the problem. I went to put it back together, and I noticed a white, plastic gear laying inside of the tranny housing. It obviosuly is supposed to be connected to the speed sensor. It is shaped like a cone, with the gear portion being on the largest portion....I am wondering if anyone knows how it is supposed to be placed on the shaft of the speed sensor.

I will attempt to illustrate.....

The gear is shaped kid of like this >:

Should it go on the shaft in this perspective ---> or this ---
The gear would be on the shaft and placed back inside of the tranny housing, but I can not see what drives the gear inside of the transmission, and I do not know which way the gear is supposed to go on the shaft of the speed sensor. Any help would be appreciated. Ok.....I found it on the tranny housing, removed it, and nobody can test it to see if it works or not. I did not want to buy the new part without knowing if that was the problem. I went to put it back together, and I noticed a white, plastic gear laying inside of the tranny housing. It obviosuly is supposed to be connected to the speed sensor. It is shaped like a cone, with the gear portion being on the largest portion....I am wondering if anyone knows how it is supposed to be placed on the shaft of the speed sensor.
I will attempt to illustrate.....
The gear is shaped kid of like this >:
Should it go on the shaft in this perspective ---> or this ---<??
The gear would be on the shaft and placed back inside of the tranny housing, but I can not see what drives the gear inside of the transmission, and I do not know which way the gear is supposed to go on the shaft of the speed sensor. Any help would be appreciated.

ok.....that is the way that I put it back in. The gear looked fine when I inspected it. You understand that the gear is on the largest portion of the cone....so if it were like this -->, the gear would be on the open end of that shape. I am wondering if you know, is that the main speed sensor, or are there more than 1? I know there are 4 ABS speed sensors located on the wheel hubs. Removing the sensor and putting it back in place did not fix the problem. What drives the sensor gear inside the transmission? I was unable to see anything in there that it connected to. The vehicle has A/C, so I would need to remove vents to see if it is loose at the guage. I do not know how I could test this sensor, as I have taken it to all of the parts stores and even the dealership and nobody can test it for me. I am hesitant to buy a new sensor, when I do not know for sure what the problem is. Thanks for your help. ok.....that is the way that I put it back in. The gear looked fine when I inspected it. You understand that the gear is on the largest portion of the cone....so if it were like this -->, the gear would be on the open end of that shape. I am wondering if you know, is that the main speed sensor, or are there more than 1? I know there are 4 ABS speed sensors located on the wheel hubs. Removing the sensor and putting it back in place did not fix the problem. What drives the sensor gear inside the transmission? I was unable to see anything in there that it connected to. The vehicle has A/C, so I would need to remove vents to see if it is loose at the guage. I do not know how I could test this sensor, as I have taken it to all of the parts stores and even the dealership and nobody can test it for me. I am hesitant to buy a new sensor, when I do not know for sure what the problem is. Thanks for your help.