tach just died

[Rob Daman]

Hey guys,

I just picked up a s52 and everything was working till today. I had noticed while driving the tach jumped from zero to working then kept working but today it's done. I checked this wire under the glovebox and tested voltage which seemed to change from 12v and down. Is that correct?

It was the white/black wire in the pic below.

Everything else works in the dash. I looked at fuses and they seem fine but they appear original. I read something about SI batteries and also just whacking it.

Any thoughts?

thanks

[Rob Daman]

well whacking it worked. i'm sure it will eventually stop working from excessive whacking though.

[greyis89]

Not sure if it's any help. I had a speedo go out on me before and after throwing parts at it and nothing every changing, I read somewhere about re-flowing the solder joints on the cluster board can help. Worked for me.

[Rob Daman]

hey thanks for the tip. i had seen a blog about needing to use oem screws otherwise it would damage the board. the ones i see on the car don't look oem.