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Electronic tachometer (DSP SYS)

Posted: Tue Oct 24, 2017 3:15 pm
by div
Hi,

I'm trying to wire an electronic speedometer bought on Amazon (brand : DSP SYS ?) :

Image

Did anyone here have the same? I dig into the forum but didn't find anything apart an old post without any wiring information.
Also watched some youtube videos but didn't find the solution

My problem is with the tachometer, the others indicators are quite easy to wire. So if you can help me it would be great!