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Old 06-25-2017, 11:15 AM   #1
Join Date: May 2017
Location: RI
Posts: 6
E21 S52 Swap Tachometer Question

I'm having a hard time figuring out how to get my tach to work. I've checked the wiring and not seeing any issue. What I've done is swapped out my 320i m10 tach for a 323i m20 motometer tach. The m10 tach would sit around 4k when the motor was running and now the new tach does nothing. Can I bench test the tach to make sure I did not buy a bad one? Or is there something I'm not doing correctly?
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Old 06-29-2017, 12:17 AM   #2
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Join Date: Oct 2012
Location: Alabama
Posts: 662
Just read your other post. Did you check your grounds again?

Also, did you only change the tach? Or did you change the whole cluster?

Last edited by sweet3; 06-29-2017 at 12:26 AM.
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