All tached out, need wiring help,please |
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All tached out, need wiring help,please |
porschetub |
Apr 8 2020, 11:56 PM
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#1
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Advanced Member Group: Members Posts: 4,703 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Changing from a 911 641 301 00 (early 70's ) tach to a 911 641 301 86 (911 SC MY 86),the early tach has a different rear plug but both share a 3 wire connection.
Bowlsby (thanks Jeff ) pic shows wire 11 as being red/white as 12V supply ,wire 13 as being earth (ground) brown x 2, wire 12 black /purple I presume is signal from CDI box via relay board ?. Late tach is #2 to 4 across the top and #5 to 8 across the bottom ,#2,6 and 7 are the only used, help please as me and VDO instruments have never been happy together (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) .TIA. |
Mark Henry |
Apr 9 2020, 06:55 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Do you have MSD? Notorious for a poor tach signal for old analog tachs. MSD has a red box adaptor that some still have issues with.
Bob Aslock's Tach Adapt is a better solution. I just put my /6 tach ('76 IIRC) in my 914 and it doesn't work. I have MSD, before I had a Autometer Monster tach that works fine. |
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