i agree, post a pic of your "jdm rpm guage"... you know after you said that every one is going to give you crap...
which ever car apples, find the rpm signal wire (all hondas are wired for a tach). On your tach (green is rpm signal)(black is ground)(red is power)(you may have a second power, in this cases power both to see which is lights, and which is gauge power. lights can be wired constant or into dash lights which are also listed in diagram above)
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