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M20 conversion tach problem


PBP

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Hey there,

Sp I decided to use the stock tach and do the tach mod conversion using a potentiometer. After connecting everything the tach still doesn't work. Is there something I am missing? The tach signal is connected from the e30 harness to the stock 02 harness but still no reading. Any advice would be great.

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What year is your M20 wiring harness from?

From what I can tell the early style harness ('87) has a separate wire for the tach that does not run through the C101 round plug connector.

The later style harness runs this wire through one of the pins int he C101 connector.

IMG_5202-1-1.jpg

1976 2002 - Mintgrun

1986 535i - Bronzit

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Mine was an 87 donor. If I remember correctly, I think I ran my tach wire independently to the coil terminal and use the potentiometer. I can look again and double check. I did this several years ago.

Pierre

O==00==O

69 2002 (M20), 74 tii, 76 533i, 79 323i, 80 732i, 84 323i (S50) 91 318is, 96 318ti (S52), 97 Z3, 02 330i, 03 525iT, 02 R1150 RTP.
Auxiliary Lamp Brackets  Kamei Reproduction Front Air Dam

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