You probably shorted something with the water, check your fuses, replace any that are "blown". If the fuse "blows" again then start disconnecting connectors on the engine and get "all" the water out and replace fuse again. Not a good idea to hose down an engine especially if it's hot. you get water on a "very hot" exhuast pipe and you may crack it. TommyTrouble
Do you have check engine light? If not you have an electrical problem within the speedometer assembly.
How do you tell the mallets only 2002 Buick regal
search for instrument cluster repair in search engine
I got a new battery for the engine and my remote quit working.
The gauges on the dash is the instrument cluster.
When engine is running there should be 13-14 volts.
Loose battery or alterator connections
The instrument cluster is what houses the speedometer, and the gauges.
The 2009 Buick LaCrosse has a V6 engine.
The 2012 Buick Enclave has a V6 engine.
The 2004 Buick Regal has a V6 engine.
The 2014 Buick Enclave has a V6 engine.