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Here's an online keyboard - it can help You to compare the pitch:
Also i remember that @Kevin M. made similar stickers himself, though i could't find them here...
IMO it is better to do without fingering tapes, even if you don't have a tuner.
You need to train your ears to know whether you are on pitch. IMO tapes are a distraction from that.
It would be good to use something like the virtual keyboard that Naska linked to.
But how about trying this: use the Musescore software to write a score of the C major scale or any scale. Then you can make the software play the scale so that you can hear it and play along with it. And it doesn't have to be scales ... to start, you could play along with any slow tune that you like, if you can get the sheet music in musescore. That way you will be hearing the exact pitches in the scales or tunes that you like. The program and some good video tutorials are free from musescore.org. I think that will be one of the best ways to train your ears and your fingers at the same time.
Her it is. Just make sure that when it is printed the scaling is set to none.