Nimo300zx

Hey everyone... I am pretty new here. I own a 90 300zx TT and recently, my speedometer has been acting up. Sometimes it would work and other times, it would not move from 0. I also noticed that when the speedometer is not working, the odometer is not moving either.
My car is a Manual tranny. If anyone has any input, I would really appreciate it.
Thanks

silvrhand

I'm not 100% sure but I do believe there is a speedo cable that hooks to your tranny if I remember right, I could be way off but I'm sure someone will come with the correct answer if that is not it.

NismoPick

Speedo cable or speed sensor... prolly one of those.

snwbrderphat540

i agree wtih the speedo cable...but what about his tach, isnt that electronicly functioned? no cables. by any chance do you have aftermarket gauge faces? by buddy did and his tach worked i think but his speedo didnt, i think it was getting caught up on the new back faces. the reverse glow ones.

NismoPick

no no... not tach.... odometer.

snwbrderphat540

damn.....ok you win. i slept every day in english class this year. getting almost a better grade than everyone else to lol.

silvrhand

speedo + odometer = cable/sensor on manual tranny.

CanyonCarver

It's a sensor...... You can first check and make sure the connections are good, and the wires are undamaged. Then you can remove the sensor and check it with a multimeter. With the mm set to ohms and the leads touching the sensor wires, the mm should go from showing an open circuit to showing continuity as you rotate the sensor. If the sensor stays open as you rotate it, it's bad. If it shows continuity as you rotate it, your problem is most likely elsewhere.

Nimo300zx

thanks for the answers... BTW, Where is the speed sensor located?
Thanks again

silvrhand

On the tranny on the passenger side I do believe it is, right about middle of the tranny.

CanyonCarver

It's called the "speedometer pinion" in the pic ----> Here

Nimo300zx

I found the pic after I had asked the question. Thanks everyone for the quick response. I really appreciate all the help.