Is there a way to use the on board computer on the 850 to get an actual mileage reading? I just ordered new gears to fix the odometer and I would like to get it set correctly.

Thanks!

I copied this from previous post (March, from Mike/hamfisted). I can't vouch for it 100% yet, however. This procedure reported 189k but the dealer reported 210k (95 850). My hunch is that this is the right way to go . . .

As long as you have the DTC boxes up under the hood ('93-'95).
1. Switch ignition on
2. Connect the fly wire to socket - A7
3. Push button 5 times
4. When LED comes on and stays on, enter code 1-1-1 as follows:
- press the button once when LED is still on
- wait for LED to go out and come on again
- press the button once when LED is still on
- wait for LED to go out and come on again
- press the button once when LED is still on
- read off response, which will be the last three digits of the odometer miles

5. Repeat steps #3-4, but enter code 1-1-2 (that is, press the button twice on the last step); read off the response, which will be the first three digits of the odometer miles. If you have less than 100,000 miles, the first digit will read as 10 blinks.
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Two 1995 854 GLT's (w/ manual transmissions)

I am coincidentally performing this same procedure to my 850 (the 15 tooth gear broke about a week ago), and can vouch that the method posted by "rockytop thad" works...I think there are also instructions on volvospeed.com ... Pretty well explained instructions there as I recall...
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Owner of a beautiful Black 1995 850 T-5R sedan