Radiator/Coolant light always on, temp fine with new components

[Ski Bum]

I have recently done a major overhaul to my 91 GSX. Included was a timing belt change along with all associated parts: tensioners, balance belt, water pump, motor mounts as well as plugs, oil, filter, P&P 14B, P&P O2 housing and an EVO GT exhaust manifold.
After installing that I adjusted the timing to 5 degrees advance and the car ran great. The idle is a bit irradic but the motor pulls very strong and hits and holds 12PSI just fine. What is happening now is the coolant light is on all the time. I thought an easy fix may be a new thermostat, so I put in a new one, 160*. The engine now runs at a lower temperature but the light is still on.

Any suggestions? Could the temperature sensor(s) need replacement?

 

[Defiant]

Fill the washer tank in the rear.

 

[badas93tsi]

Check your overflow bottle.

 

[Ski Bum]

Check your overflow bottle.

that must have been enough to throw it off. The level was just below the tube, filled it up and no more light.

:hits self in forehead with open hand:

Thanks for the help.