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you need to use your head more instead of just buying parts and hoping that fixes the problem
1) it is impossible for your radiator to hold pressure when the car is cold. heat = pressure. cold = no pressure.
2) the overflow bottle is just that, overflow. when pressure reaches a certain PSI, the fluid expands into the overflow so that you dont crack a block.
3) the gauge is not precise. you need a real gauge to monitor temperatures. the gauge jumping is a separate issue and could be as simple as bad wiring, dirty connection, etc. i'de ditch it and install a proper aftermarket gauge/sender.
4) an oil cooler/thermostat has nothing to do with your cooling system, you shouldnt even bother mentioning that.
5) buying brands like godspeed does not help your situation, it only makes it worse. buy from reputable companies like KOYO once, and be done with it. you buy cheap shit, you end up with headaches.
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