Tachometer Problem

The Thibodeaus vettenuts at efortress.com
Sun Nov 8 13:31:09 GMT 1998


My tachometer rises with engine speed up to about 3000 RPM and then seems
to stop or randomly increase a while the engine is accelerating fine.  I
have recently changed the coil to a MSD coil.  I have heard of this
happening if you installed the MSD 6 ignition, but I don't have one of
those.  I then re-installed the stock coil and the problem goes away.  I
have noticed on occasion that the tachometer seems to slow down past 4000
RPM with the stock coil.  Any ideas?  I checked the service manual but it
seems that if the tachometer works at all they say to replace the
"Electronic Spark Timing Computer" whatever that is.  Is this the module in
the distributor?  Thanks for any input.

Bob T



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