Noon Rectifier question

[Puncheon50]

I ordered a new CDI rectifier/Regulator for my Johnson 70hp. It has a short ground wire on it. I realize I am overthinking this but would it be better to ground it where the power pack ground is or just ground it to its own mounting bolt?

 

[jakedaawg]

The ground need to be right against the block, a star washer is your friend. That's all. Clean and tight ground to block.

 

[Puncheon50]

Eh, so I received the rectifier/regulator and it has a 5th grey tach wire. I called CDI and the guy said it was OK to connect it to the grey wire terminal even though I don't have a tachometer. Just want to confirm because I am not sure what is coming into the grey terminal on my J70ELCIM

 

[Puncheon50]

I guess a better question is what type of tachometer should I be looking at that works with this rectifier regulator