90 Olds 88 3.8 motor....temp light

I have a 1990 Olds 88 that has the temp light on. It had a water leak and the water pump was replaced. the fan was iffy so I replaced the motor today. I also replaced the thermostat today.

The temperature light is still comeing on. Any idea of what else I can check. Any help is much appreciated.

Thanks,
George