TPI light

[Harley350]

My truck came with the stupid tire pressure indicator or monitor or what ever (I think its called a TPI or something). My tires came with 65 PSI fronts and 80 PSI rear which made my truck ride like a truck. hehe

I lowed the pressure to 65 PSI in the rear and she rides much better, however, now my low pressure light stays on, I guess because its set for 80 PSI in the rears. My truck came with a tool you use when you rotate the wheels which I used and the light went out for a few hours but is now back on.

Anybody know how to get rid of this stupid light?

Thanks!