I have an intermittent problem with my tach. My alternator
is set to not charge immediately, giving the engine
5 minutes or so to warm up first. So the tach reads zero for those 5 minutes. Once the alternator
kicks in the tach reads normally. Occasionally, like now, the tach will bounce from zero to the actual RPM
, stay there for a few seconds, then drop to zero before bouncing back up.
Connections at the rear of the tach are all clean and tight. the connections coming out of the alternator appear sound as well. What do I check next?