Emerald280Z

that is the truth. happy i found this and thankful for the replies. removed the resistor I put on by coil and all seems to be good. running a smooth 850-900 idle

I didn’t immediately see the stock resistor there as I quickly removed the TIU with my 3yr old in tow. Just removing the TIU made the tach work! Is there a benefit or harm to removing the resistor I soldered in if the tech is working? Thanks again and happy I found this thread as FB responses months ago were not this helpful.

Gonna remove tiu and check for resistor

Appreciate it and thank you both. Will get it out and report back. May take some time to get to it.

I got that info from cali Datsun as to help with jumping tach. when I remove TIU does anything go in it’s place or simply unplug it? thanks for prompt replies

Thanks for prompt reply. I soldered in a 1/2W 10k resister off coil to tach. My car has been converted to carbs prior to me and a lot of wiring is from that conversion. Here is a pic of area of TIU. Thank you for your help. Been chasing this a while and am stumped and also limited with time and knowledge.

Wanted to revive this to see if you all can help me with my tach. Did 280ZX upgrade to my 280Z. Now it reads well at idle then if I blip to throttle it goes to 0. Eventually it goes up but bounces around. I’ve tried a new tach and it does the same. Using a FAST PS40 1.4ohm resistance coil with matchbox distributor.