Hi,
What makes you think you need it? Without an Oil Temp Gauge, you have no idea that the current setup isn't adequate. You can get Oil Temp on your '99 by using the Climate Control Diagnostic readout, the code is 1c (°C). But then, what is the Proper Oil Temp? How do you know you require additional cooling?
The old Couldn't Hurt theory isn't justification enough to do install it, especially on today's OBDII cars.
The engine needs to retain a certain amount of heat to operate efficiently. Potentially messing this up can have the DME selecting all the wrong MAPs and such. You may not even notice it except maybe in Range, or longterm evidence on the Plugs or Cats. If you don't need it, you don't need it (which I suspect is the case)...
Happy Motoring!... Jim'99
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