Why was the intake gasket changed?
If it was leaking coolant into the oil, then you have a bigger problem than the light coming on.
What is your oil pressure? Do you have a gauge or only the light?
If increasing the rpms makes the light go out, then it sounds like it is operating properly and you have an oil pressure problem.
Ignoring it will only make it worse.
You need to find out what your oil pressure actually is when the light is coming on. If it is less than 10 psi, the you have a bigger problem. If the coolant got into the oil from the intake gasket, then it has likely done damage to the bearings.