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first thing u have to do is use a scanner to read the code if u dont have one u can go to autozone or some other auto parts they can scan you car for free but your problem is the speedometer cuz check engine light and the fail with the speedometer is completely diferent things if check engine ligh still on u have other problem good look
Since the Speedo and Tach both quit working and they use separate sending units, I would be looking for a common electrical plug they share under the dash behind the speedo. When you find said plug check to make sure that it is plugged in securely. if it seems to be plugged in well unplug it and then replug it just in case the contacts were getting a bit dirty or corroded.
You have two sensors on the engine that send a signal to the computer, speedo, and tach. If just one of these sensors goes bad your speedometer and tachometer can just stop working. Check if these sensors are blocked or if broken then replace.