'95 3.4 Camaro Temp Increase

I have no idea why this is happening. Once i hit 80MPH the temp on the car increases pass the middle line and stops at 3/4 of the display.

I changed the thermostat on it and didn't make a diff.
Made sure the radiator is full.
The fans some times kick in late. When i purchased this car everything worked on it just fine.
What i think is that the radiator might need to be flushed. I have changed the temp sensor and the Dash Temp reader.
I need to flush the radiator to see if that work, but before i do that, any suggestions?
Also the LowOil light comes up during a cold start. It wont go off untill i shut of the car and turn it back on.
I have changed the Oil level sensor. Its is working correctly on the dash.
Any idea what can cause this error on the Computer?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.