Hello everyone, I have a 95 freightliner fld120 with a 12.7 Detroit series 60 in it. I notice my rmp guage isn't working but sometimes works for short periods of time. Where should I start looking to see if it's a faulty sensor or faulty guage? Also I have a vacuum guage as well that isn't working at all. Thanks in advance!
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95 Fld120
