Hi there fitting a wunderlich rev counter to my r18 waiting on it coming from nippy Norman's anybody out there any tips on installation please 

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How does signal wire connect is it plug and play or a bodgeInstallation is easy and straightforward, a little more complicated if you have a windshield and not compatible with barbacks.
You will receive a Posi-Tap connector to tap into the one of the wires the other is plug and play into the aux plug needed to supply the tach. Instructions are very straightforward and connectors are very easy to use. I would not call it a bodge (had to look up the definition) https://www.posi-products.com/posiplug.htmlHow does signal wire connect is it plug and play or a bodge

Job's done thanks for your help didn’t use that plastic thing soldered connection much betterYou will receive a Posi-Tap connector to tap into the one of the wires the other is plug and play into the aux plug needed to supply the tach. Instructions are very straightforward and connectors are very easy to use. I would not call it a bodge (had to look up the definition) https://www.posi-products.com/posiplug.html
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I don't understand, why not just choose the RPM readout on the speedo ? For safety sake, your eye is already off the road looking at the speed and can see the RPM with the same glance instead of a separate instrument?