I got the speedo working today. It has an optocoupler to interface the frequency output from the VFD to the 12 volt active low of the speedo. See images below.
I cant for the life of me get the tacho going. From checking the wiring when I removed the ignition, there is a 1k resistor from the low (switched) side of the coil to the tacho. I have tried a high side opto and low side but no success yet. I really want the taco going so I can use it to read out RPM, torque, current, voltage or whatever parameter I choose.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2RLZ8QI1-pSNEGukmLLZ5zmMRtWiZuJ7PtRbNF_YnoiAapsjRLuvkbPxhy9ZikwS6UJQVUq_BVNxCvSLAugnuBUTYDJ7zTxsbTmH703qmUtssBAWxJff1MQ3FdIX8G3TIzHeI0zieYXs/s320/06012009(001).jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3ssan3TC-02Ddi_TKXAthGmzjP-743ORCTYTbkDoo8OrnoXUp4gZoQqJltB9Mv4uaSS95JyIaABnwFTdJ2klKgvytIzZrRiKAtsPPo8Lnq5lr-rCdAnPxz50k46lu1VCSHbCDgRK7afM/s320/06012009.jpg)
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