Originally posted by ForcedFirebird
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E30 with S50 and E30 M3 cluster - tach coding plug
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The coding plug dictates the number of cylinders for the tach, and fuel sender type. The gauges themselves are the same.
Looks like a simple wiring jobber. Went ahead and took some screen shots while answering emails this morning. On the driver side pull the connector, jump the two brown/green wires together:
Compared to early single senders:
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Originally posted by mjweimer View PostForgive my ignorance - would swapping the late model fuel gauge from the 325i into the M3 cluster solve the issue of the fuel level reading properly or is this issue driven by the coding plug specifically?
MJ'72 2002 pickup | '88 M5 | '89 330is | '89 M3 | '01 Z3M | '11 328xi-t
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Originally posted by e30austin View Post
It would 100% solve it except for the M3 unit has the red needle. I don't want to swap it over or paint a 325i unit - it'll never match.
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Good discussion guys. I posted my question because I was always under the impression that the coding plug only altered the tach signal and the fuel gauge was calibrated to match the set-up of the car (level sender arrangement/tank size). This could be incorrect.
In other threads I have read how folks have put a later model 325i cluster in an early 325i chassis and simply swapped the speedo (for correct mileage) and fuel gauge to correct its reading. As with many of those type of threads, there does not seem to be much follow-up from the OP to determine if it actually worked...maybe they also swapped to the earlier coding plug.
Based on my information I was planning to swap the fuel gauge from my '90iS into the M3 cluster (with the M3 needle) as well as install the E28M5 coding chip into the '90iS coding plug to correct the tach for the M52's higher redline. I am nowhere near getting my swap running but I can try this at some point and report back results. The wiring change looks really easy (thanks for posting the ETM pages) so if I need to make the change it won't be a big deal.
MJ
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