They are the same sensor, located in the rear differential. In my case, the sensor broke off and got in between the teeth on the limited-slip gears. This caused several teeth on the limited slip to break. Long story short, the differential had to be replaced (luckily it was under warranty). THIS IS A COMMON PROBLEM FOR THIS MODEL YEAR.
check your fusible link, its connected to your positive battery cable,check for burnt marks or it might be swollen.
the little gear that turns the numbers is broke and the only way to fix is replace the whole speedometer.
I am not sure if the 1999 is a magnetic pickup but my 2000 or late 1999 uses a magnetic pickup that screws into the side of the transmission. It has a wire plug that unplugs from it and they you can unscrew it from the side of the transmission. When my speedometer quit working it also cause the transmission not to shift correctly. I unscrewed the magnetic pickup and it was covered with iron filing which I removed with a clean cloth. When I screwed the old pickup back in the transmission I made sure it was not in far enough to rub on the gear teeth that rotate by it. The speedometer and the transmission worked fine after removing the iron filings from the end of the pickup.
The brake lights in your 1983 Nissan pickup truck are controlled by the brake light relay switch. When the brake light relay switch malfunctions the brake lights will stop working.
Someone knocked a wire loose.
Check the radio/Acc fuse...
The exact location of the speedometer cable is dependent upon the make and model of your 1994 pickup truck. In general, the speedometer cable goes from the speedometer to the speed sensor.
There is no speedometer cable on that vehicle. The speedometer is driven electronically.
Check for a loose wire or loose fuse
The speedometer is electronic on a 1999 Ram, and does not have a cable.
There is a wire harness. The bulbs tend to go out.
I have the same problem replaced speedometer clurstor got one out of wrecking took awhile to find one that worked ps you chang the sensor on the transimission . hopes this hepls