You will first have to clean & put dielectric grease on the couplers for the left handle switch "up/down" buttons ..(that's under the fuel tank on the right side) ,the shift motor (that's on the frame rail upright) ,angle sensor .. And it wouldn't hurt cleaning & greasing any other coupler you see ..
Here are 2 PDF files from the 1998-04 TRX450FE Honda shop manual ..
this is section #20 lights,meters,switches (there are tests for the oil light ..
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