Hey guys , I just bought a Gtti tachometer to my CB23 carburetted charade , and everything works when I connect the cable to the dashboard (lights, speedo, turn signals) but the tacho shows 4000rpm when I turn the ignition on. And the same when I start the engine. Did somebody do the same ? I really want to have working tacho 
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looks like its a 4cyl tacho and not a 3cyl one would be my guess
No it’s a GTti tacho , 3cyl
It has turbo light too
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