RPM Gauge dead I've been doing a new dash install job on my '90 E30; did a test run two weeks ago to verify that all gauges were working and they were. Today I was at it again trying to put all of the remaining trim back in place and I discovered the battery was dead. Didn't think much of it - the car has hardly been run all winter. I jumped it with my truck and in the process of working on the trim I realized that the RPM gauge was no longer working. I checked fuses 10, 12, 21 per Bentleys and soaked all the harnesses on the back of the instrument cluster with DeOxit. SI batteries test @ 3v so they are not dead but I suppose the board could be fried from jumping the car? Not sure what else to do other than check for ground and continuity; wanted to hopefully get some advice as well. Thanks. PS the speedo may be dead as well; I can't drive the car right now to verify.