My Tach gets stuck at 4k and I plan on getting a new tach, I have a 73 so will I have to get a tach from another 73 or maybe even out of a 260z? Thanks!

I have heard that earlier 240Zs have two different tach wiring setups, but haven't heard the same said about 1973 models. My fiche shows 24855-N3301 for tachs dated 8/72-7/73 and 24855-N3600 for 8/73-8/74. While the part numbers supercede, I bet it's the same tach since (IIRC) the wiring changes between the two years are not substantial...

Maybe PM one of the 260Z owners?

here's a useful link I found doing a quick search...it may help you also.

http://classiczcars.com/forums/showthread.php?t=23408&highlight=3-wire+tach

and,

http://classiczcars.com/forums/showthread.php?t=22273&highlight=3-wire+tach

I have a 73' Tach in perfect working condition I'd be willing to let go . . . that is if you're interested. . .

I would like to know if all tach from 240z to '77 280 has the same wiring? or the same plug and play?

I bought one in ebay today.

This is the tach. let me know if these would work on the 280z.

Definitely a 280z tach by the plug and mounting technique. Which year? I'm leaning toward 77-78 by the font on the face, but some else might chime in. Likely work on any 280z with a matching plug.

The tach connections are the same for all 75-78 280z, +12v (blue), ground (Black) and a trigger (Blue/White, all harness side, not tach wires) from the negative side of the coil (via a 2.2K ohm resistor), so any 280 tach can be made to work if the plugs are not the same.

Jim

My Z is a 77. Thanks for the info. Won the bid for $30. At last, I can replace my stuck needle tach. no more sticking.