With the light being intermittent before, and now after your cleaning it is on all the time, my guess would be that your cleaning job changed an intermittent short into a permanent one. The best way to check is to disconnect the wire from the oil pressure sender switch and then measure the resistance (or continuity) between the connector on the oil pressure sender switch and a good ground point with the engine running and without it running.
The sender switch is on the left side of the engine block, just forward of the oil filter and just rearward of the generator (or alternator if yours has been converted).
It should be close to zero ohms on an ohmmeter (or good continuity on a continuity checker) when the engine is not running, and infinite ohms (or no continuity) when the engine is running.
This post was edited by Sean in PA at 07:25:11 10/08/12.
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