Why? For fun of course! The best /cheapest way I've found: Go to Fred Meyers or wherever and get a poultry thermometer long skinny style. Get the highest temp you can find, avoid digital. Order a spare dipstick, cut the dipstick part off and drill a hole the same size as the thermometer shank. Sick it through and use high heat rtv or glue to seal it in. Booom instant oil temp gauge! For like $20! You can pull over after speed runs and get your oil temp reading.