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its really a good idea to have an oil pressure gauge. relying on a warning light is a little scary. it is possible to have lower than normal oil pressure without having any of the signs yet (valve tap, bottom end knock, etc)
if you plan on going sr, (im not sure how the rb's and ca's are with heat), getting a more accurate water temp. gauge is a must. they normally run a tad on the hot side (without any mods to the cooling system) and they can overheat quickly, so getting a real numerical temp. gauge will help with the slightest changes.
it really comes down to how much you have done to the engine. the time and money is invested, the more you may need/want to keep an eye on.
for example: say you upgrade your fuel pressure regulator to an adjustable unit. some have a gauge right on the unit, but its nice to know what its pushing when you're in the car.
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