Check the ground to make sure it is tight and has good contact to clean metal. There is a 3 amp fuse between the key switch and the voltage stabilizer. It could also be the voltage stabilizer. Hope this helps
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deffinately do check the fuse aft of the cluster... post back..
until you do get it fixed, wire a low wattage lamp from switched power to the oil sender.. switch on, lamp on, engine not running.. engine running lamp off, if you have oil pressure.