I have just started go carting and i having a problem with oil temp gauge. When I first started the engine the gauge worked fine. But the last few times I have started it the needle never moves. Oil pressure is fine however. I have only run the engine for less than 20 minutes each time but I would think I should be registering something. I am using a mechanical autometer gauge and was careful not to kink the hose anywhere. What else could be wrong.