1997 SAAB 900s speedometer and tachometer not working

see if this forum helps you out.... https://www.google.co.uk/webhp?sourceid=chrome-instant&rlz=1C1CHBD_en-GBGB719GB719&ion=1&espv=2&ie=UTF-8#q=1993+Saab+900s+temp+gauge+just+completely+stopped

check for a blown fuse in the fuse panel and if its not that pull the gauge cluster out of the dash and check the power and ground going to it cause most of the time its a bad ground wire or power wire cause people tend to kick wires under the dash on accident or they get worn or come apart

Try to tightin up the light bulb. be aware the only way to do this is to remove the hole dash. if you do not know how to do this i would recamend you take it to a shop are ask me to go through step by step directions.

bad dimmer switch

Have you check the fuse to see if the fuse for the gauges are bad, also there is a fuse box under the hood that may contain additional fuses if one is not located in the fuse compartment under the dash.

Have you tried replacing the coolant temp sensor?

Windows on your car are controlled by the convertible top computer. You will have to have someone check the car with the factory tool. The computer is in the trunk on the left side.

I'm afraid if you don't have the code, you will have to take it to a local dealer or specialist radio store to have it re-coded.

Fortunately, it's not expensive.

did you check for loose connections in the wiring harness, fuse box, or fuses?

I'm not sure this will fix it, but it's the "obvious" solution if it's real simple. Is there a button above the radio that says "black panel" ? If so press it and the lights would come back on. If that's not it, then it's probably a blown fuse. Open the fuse box (see owner's manual for location on your model and year) and look at the fuses to see if any are discolored or broken.