my bet is there's absolutely nothing wrong with your original rad, 15* difference is fine, especially considering the reading at the top is fine, the engine is NOT overheating
2nd, your gauge will read no different with a different rad
3rd, you really have no problem that requires spending money beyond maybe finding a used gauge that will read further down so it's easier to see sudden changes in behavior, which is really what the gauge is for, indicating if things change from "normal", and right now it sounds like your cooling system is 100% normal
Bill
