Vintage SW tach issues
I just finished up the resto on my 69 Chevelle, and i wanted to install the original late 60s Stewart Werner Greenline Tach.
this tach is one of the ones that used the separate little box to connect it.
the issue i am having- the tach works, however the readings are a bit erratic. sometimes it will read idle rpms correctly. but then when you rev the actual engine RPMs dont match the tach reading. or then when it drops back to idle, it will read high.
basically the readings are off someway. is there any testing or checking I can do? or it is just old and needs restored by someone?
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