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I have had my Gipro GBDT-D01 ftom BDS Racing for two years and it has been faultless. I chose the blue display because it is clearly visible in daylight, dims at night, and tones in with the instrument backlight. I think red should be reserved for warning signals etc. The good thing about the Healtech is the quality of the software which allows it to learn the gear/speed /rev relationship very quickly. The instructions also come well written in English(!). No, you don't 'need' one but it is very nice to have particularly in very noisy road conditions when you can't hear the revs clearly or when the speedo is unreadable because of bright light. You will soon find other conditions when it is useful. There is no need to alter the wiring in any way, a good quality connector with pass through is provided and the unit goes into a very low power mode when the ignition is off. A big thumbs up I'd say.
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