Ok, I'll wrap this project up now and leave it wait for next winter . Not willing to remove the tank twice in a row, though it was easier than expected, thanks for the good forum guides to do it.
As a summary, I tried to connect tacho's green wire to coils black wire (0V), but it didn't bring tacho live. The other black-red wire had 12V. I still wonder what DS inst guide says .. connect to coil's negative terminal. Did I think it wrong way ? The one to distributor is negative ?
As a novice it's been a good learning project, but today I'd order the OEM tacho.
