Why did the speedometer stop?

I read where there is more than one speed sensor. I think it said there are two on the driver's side, and they are about $83 and some change each.

I give up, thieves broke into the mechanic's shop, stole another mechanics tools among them, the cord to check the OBD 1 cables. Jump wire doesn't work because I think the check engine light may be burned out. I get several answers as to the problem. One person says it is speed sensor in the transmission, another says it is in the tires having to do with the ABS system. We do not have a Lexus dealer in Tallahassee, the nearest is 3 hours away in Jacksonville. I know it is a Lexus, but my wife picked it out, I love the organization and scale as to how it is designed, but I swear, I hate the car, it is causing me to lose my mind. Today, it started that idling high and no A/c again, and then that O/D light stopped flashing. We burned up for miles in traffic and then, it went to working again and that O/D light went to flashing, and at no time did that speedometer work. Most of the mechanics in Tallahassee are just here to take the college Kid's money. I have the internet link to jumping out the wires at the terminals under the dash and the hood as well. Is there a way to hook up a test light instead of using lights on the dash to check diagnostic codes?