What really matters for engine health is the oil temp. If the temp exceeds the oil rating it loses some lubricating ability which can cause additional friction, heat, and wear. If the bike is stock I wouldn't be concerned about the temp.
If you don't need a readout while driving I would look into dipsticks with a temp gauge built in. I have a carbed bike where the temp especially when modding is important and some people install an oil cooler depending on what all mods have been done to the engine.
Does your bike have a problem to cause you concern?