-:-L just means it hasn't been driven on a long enough journey to take a long term reading. It takes a journey of 20-30 minutes in my experience. There's also a way of taking a short-term reading, if you look in the handbook, I've never bothered.
If it was showing +1.0 within the last 2 weeks you've got nothing to worry about.
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Now with added SG CSL.
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