Well, the back of the console is fed by a pair of plugs that feed signals to the sensors via this sheet of plastic with metal traces on it (kinda like a flexible circuit board). Chances are, some water got in there and is shorting the leads from the tach into the temp guage and taking the juice from the ammeter. Since you didnt mention the fuel or oil guages going haywire, I would say the plug torwards the drivers side is the culprit. Check the traces from here. I think a visual inspection should reveal some burnt plastic.
Have fun!
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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