280Z Tach in 240Z Wiring

[Dr_Rich]

I just had a Wolf Engine Management System in my '73 240Z.

My stock 240Z tach doesn't work, and I was told I need to install a 280Z tach in it's place to work.

I now have the works out of a 280Z tach into the shell of a 240Z tach.

 

My question is how to wire it?

I read that you must switch power and ground. But where do I get the tach signal from?

 

Here is a pic of my 240Z Tach wiring BEFORE I transferred the 280Z works into the shell.

 

 

 

 

Here is a pic of the back of the 280Z tach sans wires. which wires go where?

 

 

Thanks in Advance!

 

~Richard

[Phlebmaster]

You have an awesome looking ignition system. The coil packs are cool and the distributor with no wires look weird.

 

It sounded good too.

[Dr_Rich]

You have an awesome looking ignition system. The coil packs are cool and the distributor with no wires look weird.

 

It sounded good too.

 

Thanks for the kind words.

I am pretty happy with the install so far, and I don't miss the wires crossing over the valve cover.

 

I will post some pics later today.

 

Thanks again!

[240zchevyv8]

Hello on the 240 tach the common wire (black one) is on the top but on the 280 it is on the bottom so swap these wires around and connect the white wires as normal and see if it works. If you use the 240z plastic back piece change the little metal clip to the new common place other wise you will put a live short through your tach regards heath.

[Dr_Rich]

Hello on the 240 tach the common wire (black one) is on the top but on the 280 it is on the bottom so swap these wires around and connect the white wires as normal and see if it works. If you use the 240z plastic back piece change the little metal clip to the new common place other wise you will put a live short through your tach regards heath.

 

Thank you very much for the info.

I kinda' thought that was how to wire it, but I didn't want to fry anything trying blindly.

 

Thanks Again!!

~Richard