Goofy tach and speedo ={

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Goofy tach and speedo ={

Postby mistamontiel » Thu Jan 25, 2018 5:19 pm

ST184 , 92 Celica GT-S

So my tach is very bouncy and typically when I'm cruising she'll drop dead 0 er somehow maybe not no more forgot my last ride

Well this makes me 3-2 rev match a pain in the ass er any of the rev matches total guess .. it's always like throttle input memorization

My speedo jumpy too .. almost always showing way too high

My mech say the speedo is still cable operated , no electric sensor ..

I've the lithatoyotaparts store site (THANKS Corey!) .. so what exactly must I key in ?
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Re: Goofy tach and speedo ={

Postby underscore » Thu Jan 25, 2018 6:11 pm

My guess would be dried out capacitors on the back, or a bad ground.
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Re: Goofy tach and speedo ={

Postby mx6er2587 » Fri Jan 26, 2018 3:23 pm

Tach is definitely going to be failing capacitors. Super easy fix. There's a couple threads on it if you search a bit. The speedo makes less sense. As you noted they are mechanical and shouldn't read high ever unless your running a different overall tire diameter. There could be some worn/stripped teeth at the adapter on the transmission that could make it "bouncy" though.
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Re: Goofy tach and speedo ={

Postby mistamontiel » Tue Mar 06, 2018 9:10 pm

https://www.youtube.com/watch?v=sbowe0UhT-k

It's that bad, less than half the time it behaves

I recall just pulling out of parking space and it zipped to 50

Maybe in the tranny or tire diameter, will investigate thank you!
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Re: Goofy tach and speedo ={

Postby mistamontiel » Fri Apr 05, 2019 3:09 am

..and I can't find this kind guy's thread with pictures! On how to pull the tach out and put new capacitors :doh:
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Re: Goofy tach and speedo ={

Postby EvilStig » Fri Apr 05, 2019 4:55 am

my friend had this issue with her alltrac (before it later became my alltrac). I'll ask her about it, but as I recall there was a pickup gear in the transmission attached to a cable or something, and the gear was made of something soft and had worn out or something. Probably a common weak point.
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Re: Goofy tach and speedo ={

Postby FC Zach » Fri Apr 05, 2019 6:02 am

Yes, the "driven gear" is a plastic gear pressed/bonded on a keyed metal shaft. If that gear breaks a tooth or the keyed end of the shaft breaks, something caused it and that is most likely a defective cable adapter although it could be a cable issue too. My cable adapter locked up due to bearing debris getting between gears which broke both the key and gear.

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Re: Goofy tach and speedo ={

Postby mistamontiel » Fri Apr 05, 2019 6:09 am

Speedo is ok minor wobbly works more often than not!

Just having this my first stick/standard three pedal n box and the tach is shit only readable if hold the window switch is damning!
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Re: Goofy tach and speedo ={

Postby EvilStig » Fri Apr 05, 2019 6:15 am

mistamontiel wrote:Speedo is ok minor wobbly works more often than not!

Just having this my first stick/standard three pedal n box and the tach is shit only readable if hold the window switch is damning!


speedo will probably get worse, in worst case stop working altogether like this one did... makes it hard to keep track of mileage and maintenance since the odometer is tied to it and will also stop working. No clue how many miles are on my car between when it broke and when it was fixed. Maybe 20k. Maybe 100k...
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Re: Goofy tach and speedo ={

Postby Corey » Sat Apr 13, 2019 12:10 am

mistamontiel wrote:..and I can't find this kind guy's thread with pictures! On how to pull the tach out and put new capacitors :doh:


viewtopic.php?f=49&t=48848
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