Getting your early 240Z tachometer working with an MSD 6 Series ignition.

[eds240z]

Thanks for the reply! I'll check the charging system tonight. By the way I'm running a internal voltage regulator alternator if that matters. Also I've been doing more research and I found some people added a diode or resistor. I haven't done this. So I'm reading up on it but I don't see where I need to add this.

[Apollyon12]

This fix also works with the tach signal from an L28et

[madkaw]

So I am looking at this solution for my set-up. Running MS3 with LS1 coils on an original 71 current tach. The directions from Turbo6inKY  above says to hook the black/white stripe up to a 12 volt ignition source. But originally the black/white going to the tach was hooked to a 12volt ignition source, so why not use this right?. Maybe over thinking this, but want to be sure.    

[eds240z]

I tried using the msd tach adaptor 1st and didn't work. I found an old thread that said to use a 280z tach with modification and it worked. Here's the link good luck!!

 

http://forums.hybridz.org/topic/66137-how-to-modify-a-280z-tach-to-work-with-msd-for-free/

[THUNDERZ]

So....you are saying that this approach isnt right?

 

Dan,

I checked the wiring on my '72 this weekend. Here's what I've got:

Black/white wire(previously coil +) connected to red wire from tach adaptor.
Green/white wire connected to swithed +12V.

I hope this helps.

graemlins/cheers.gif 
Don 

[jacky4566]

Bumping this thread a bit but I wanted to add.

 

For people with older Current sensing tachs and 6x coilpacks you can simply pull the power from the old distributor terminal. The tach will sense the current draw on the COPs. Worked fine for my toyota 1zz coils.

 

I learned this of course after i had already wired them all on a separate line haha.