Odometer & trip meter stopped working.

There is a plastic gear in the speedometer that eventually breaks on mechanical speedometers called an odometer drive gear. This will involve removing the speedometer from the instrument cluster in the dash.

15 ft lbs then angle torque 90 degrees

How many miles are on this vehicle? I ask because the odometers in these car stop working around the 140k to 170k mark. Did the button comeback? Is this the mileage on the digital or analog trip meter?
The process to change the odometer gear is fairly straight forward and takes less than $20 and an hour. Let me know.

the speedometer on this car is worked via an electric signal
from the abs system,if the odometer trip has failed it will
require a new speedo head as the odometer is integral
part of the speedo.should be able to pick up a second hand
unit relativly cheaply.
cheers Brian

There is a gearset in the odometer that strips out. If you would like info on the repair let me know.

Possibly a little gear inside the odometer has broken down. You find theese gears easily on E-Bay. http://shop.ebay.com/?_from=R40&_trksid=m38.l1313&_nkw=volvo+850+odometer&_sacat=See-All-Categories

Short of buying new, there is no known way of clocking it.

where do the vaccum lines from the air cleaner in my 96 850 glt go?

This has been a problem with VOLVO especially the 850 models what happens is the plastic senssor inside the speedometer breaks off and it will tell you the road speed but ODOMETER AND TRIP METER will not work and the only way to fix it is to take the cluster out and sometimes it can be soldered back in place or get a used cluster and replace the unit sorry but it is not a simple fix

go to your local volvo dealership, and you must have the car in your name, but ask one of the mechanics if you can have the code for your radio, they'll look it up and give it to you I believe.