90 honda accord erratic tach

90 honda accord
driving to work this morning and for 3 or 4 seconds the tach jumped up and down erratically. Never happened before. Only happened once.
Engine ran fine while tach was jumping. No other sysmptoms. Speedometer seemed fine.
G
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Either: 2) Your igniter is failing. Replace it before you get stranded. Or, 2) the tach signal wire (blue wire) connector in the distributor is corroded and making intermittent contact.
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Tegger

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Gene Wagenbreth wrote:

to add to what tegger says, it could also be a defective tach. my 90 crx had one. symptoms exactly as you describe. if you get a replacement from a junkyard, it's about a 10 minute job to put it in.
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