my tach just started jumpin up and down today out of nowhere.... then came to rest at 0... and eventually started working again but displaying the wrong RPM. i suspect that its NOT a fault in the actual tach but a fault in the sender unit or connection between the two. can anyone tell me what feeds the tach its output? (is it off of one of the coil triggers or am i remembering that incorrectly.... and does it pass to the ECU before going to the gauge cluster?) ive been having problems with bad connections at the sender units for various unrelated things recently... i guess i need to just unplug the entire harness and clean all the connectors one of these days cause things are going bezerk. thanks for the help as always . -heath

 

According to page C-1 of the Body Electrical Manual, the tach gets its data direct from the CPU. The CPU I would imagine is using the crank sensors. You might start with the connector between the body harness and the gauge cluster.

Dave

 

Hey Heath

1) Consult these 2 threads:

- https://www.rx7club.com/3rd-generation-specific-1993-2002-16/those-gauge-cluster-problem-467742/
- https://www.rx7club.com/3rd-generation-specific-1993-2002-16/tach-not-working-ive-searched-too-449013/

2) Gimme your email...there's a PDF about this I think you'll find useful. It's too large to upload.

~Ramy

 

Ramy, thanks for posting those links! i've had a problem with my guage cluster (on the long list of **** to do) and i'm definitely gonna use that tomorrow.

 

telum01, my pleasure Shoot me your email too (unless someone can host the file). The PDF is the same one referred to in the 2nd link, w/ detailed pics and what not.

~Ramy

 

If you want, you can email it to me (attila @ atihun.com). I'll host it and provide the link.

Attila

 

Thanks Attila...emailed ya.

~Ramy

 

Here ya go: (right click...save target as)

http://www.atihun.com/downloads/Tach_Repair.pdf

 

Thanks big man

 

just got back to this post (was working on another broken car this weekend so no time for the 7). thanks guys... im eager to find out where this gremlin is living under my dash and kill him

 

I don't want ot thread jack here, but it is sort of the same subject. My odometer is blank. I can't see it with the lights on or off. Some times it flickers, but not enough to read it. Anyone else everf delt with this?

thanks,
-josh

 

recon, there is a light bulb behind the odometer that lights it up whenever the IGN is on. Sounds like yours needs fixing (loose, corroded, bad, etc). You'll have the remove the entire cluster to get to it.

 

hey FDNewbie, could you share that PDF with me too?

pugg57@gmail.com

 

Just right click on the link above and save it to your system.