szac said:
As DSUZU predicted the tach was off ~1000 revs.
Tons of respect for Dennis, but I'm not so sure the tach could have been off by "1000 revs". I think it depends on the RPM -- because it's probably off by a percentage. For example, at an actual 1.000, the V6 tach would indicate 667 RPM (although it obviously doesn't have that level of precision).
Now, whether the potentiometer adjustment can correct that, I wouldn't know. I did the same tach swap on my Amigo, but I did my adjustment by guesstimate. I adjusted it at idle so that the tach indicated the expected idle RPM. But when I revved the engine, the tach always seemed off (low). I never bothered to check it, though.
You may want to compare it at different RPMs if you're concerned about accuracy.
Jack