Those are reasonable shifting speeds.
When I first got my 240, it didn't have a tach either. After I got one, I found that I had been shifting at around 3500RPM, because the noise the engine was making sounded like it was near redline! With the stock cam, though, that's not a bad shifting point.
If you want to find out how far you can rev the engine, hold it in first sometime until it hits the limiter (it will feel like the car just shut off), then let off and shift. This will give you an aural impression of how much room you have to work with.
Personally, I like to run the motor hard fairly often (high RPM) to keep carbon deposits from forming. 100K miles of low-RPM driving can affect your motor the same way a lifetime of lard can affect your heart. Pick up a tach from a pick-n-pull - they're cheap, and a good gauge to have.
When I first got my 240, it didn't have a tach either. After I got one, I found that I had been shifting at around 3500RPM, because the noise the engine was making sounded like it was near redline! With the stock cam, though, that's not a bad shifting point.
If you want to find out how far you can rev the engine, hold it in first sometime until it hits the limiter (it will feel like the car just shut off), then let off and shift. This will give you an aural impression of how much room you have to work with.
Personally, I like to run the motor hard fairly often (high RPM) to keep carbon deposits from forming. 100K miles of low-RPM driving can affect your motor the same way a lifetime of lard can affect your heart. Pick up a tach from a pick-n-pull - they're cheap, and a good gauge to have.
