The bulbs that illuminate the Fuel Gauge, Temp Gauge, Speedometer and Tachometer are Bulb “194”. But best is to use Volvo PN 942571 or Osram-Sylvania 194. Dealer usually charges 1-2h labor just to replace this stupid bulb.
It was Sunday and I was stuck, so I bought the Eiko Brand Bulb “194” from Oreilly (made in Taiwan), and it turned out Eiko brand is a bit brighter than the rest, a bit annoying. So the lesson is buy Volvo bulb to get the same wattage (3W or so). Later I found out Menards Hardware sells the Osram-Sylvania 194 pair for $1.70!
To change the bulbs in the Instrument Cluster, the procedure calls for dash trim removal, which is a pain, however, once you have done it and familiar with it, a dash trim removal should not take more than 30 minutes.
You might be able to remove some of the bulbs FROM BELOW by removing the knee trim under the steering wheel (one single Torx-25 Screw). It is a bit acrobatic but with some skills, you can replace some bulbs from BELOW. Some other bulbs are hidden and impossible to replace from BELOW. A Flashlight will help a lot when you lay on your back looking upward! Only the bulb behind the fuel gauge and temp gauge can be replaced from below (without removing the dash trim!).
For my 1998 V70, the Air Bag Ground Strap was recalled in 1999 (1 year after I bought the car; bought car in 1998) because of “poor grounding”.
I’ve mentioned a cable I made when I replaced the SC-816 in my 850R with an SC-901 and C70 4x100w Amp, and promised a write-up for a long time. I’ve finally pulled everything out to take pictures and will try to explain it as clearly as possible.