Tachometer RPM's Reading Low

[elemgee]

My 94's tachometer recently started reading low RPM's. At idle, for instance, it reads around 300 rpms. When accelerating, the highest it will read is around 1,400 rpms. The engine runs and sounds fine.

Thought it might be due to the very cold weather we're having here in the northeast but its around 60 degrees today and the problem persists,

Any ideas?

Thanks.

Larry