Hi JJ,
The circuit is fine; the resistors are not required.
The battery indicator that you show is a voltmeter and, if the battery is a 12V lead/acid type, will indicate about 14.5 volts on charge and 12.25 volts when not on charge.
You can add two other indicators:
(1) Ammeter in series with the positive battery charger lead to indicate battery charging current.
(2) Ammeter in series with the positive output from the speed controller to indicate motor current.
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