tach question - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
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#1 (permalink) Old 06-22-2004, 04:25 PM
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The speedo stopped working in my 87 325 eta a couple of years ago. I found a dash in a junk yard out of a 318 and put it in the 325. I can't remember what the car redlined at with the old tach. But, it easily goes over 6,000 with the one out of the 318. I'm thinking it is set up for a 4 cylinder and I am not getting the correct reading. There is no way an eta engine would rev that high, right.
How can I get it to read the rpms correctly?
Thanks.
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#2 (permalink) Old 06-22-2004, 04:46 PM
You Can Has A Custom Title!!
 
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i would think it would still read correctly, i once put a eta tach (5k rpm gauge) in my 325is and had no problems with accuracy. warm up the car and try to push it past 4500rpm, if the revlimiter kicks in at an indicated 4500rpm then the tach is accurate, if its way off then just try to find a proper eta tach.
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