Oil Pressure Gauge
Discussion
How can I check for a short on the wiring between sender and gauge? As soon as ignition is switch on the gauge goes off scale, but no warning light so assuming pressure is OK. I took out the bulb to take the attached photo and the gauge operated normally and then went off scale again.....Gauge has three connections plus the bulb wiring as attached photo, apologies for blurry image. Thanks.... 
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