my speedometer on my 760 volvo 1988 dosen't read correctally. It is well inder the correct readout. 33 miles per hour is what it reads when im doing 65mph. I was wonderint what i would have to do to fis this do i need a new speedometer relay or just a new speedomoeter or can i fix this one. If i need any new parts where can i get them. thanks

 

is this tied to the problem that when i start to drive my car the anti-lock brake light comes on and everything is fine?

 

Most likely yes they are tied together.

The ABS sensor sends signal for the speedo.

 

what would i do to fix this?

 

First inspect the wiring to the sensor. They are known to break a wire or it will pull out of the plug.
If all is good replace the sensor.

 

so just pull it out of the dash and check plugs....thx

 

No not the Speedo!

Look in the back of the car.In the cover for the rear end. You should see the sensor in the center of the cover.

 

as in the trunk of back seat im lost sry

 

Under the car where both axles would meet in the middle.The cover on the rear end (Where the axles are mounted in)that faces the rear of the car has the sensor in it.