If you look you should see a little hole.You need to use something small and insert it in there and push to reset.
But if that doesn't work you will have to reach from under the dash to the back if the instrument cluster.Reach up and feel around for a small pipe and follow it and feel for a little switch.Feels like a mini light switch.Move it with the key on and that should reset it.
there is a small switch in the instrument cluster that can be pushed in with a small object (paper clip). I can feel some spring action in the switch but can't tell if it is actually working...the service light is still on, I tried to reset with the ignition on. I am planning on putting in a tach, so I will have a closer look when I get there .