Thank you 304065, that is the other type of "work around" I was seeking in my original post.
I am currently expecting delivery of Bob Ashlock's "Tach Adapt" which should take care of my issue.
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Thank you 304065, that is the other type of "work around" I was seeking in my original post.
I am currently expecting delivery of Bob Ashlock's "Tach Adapt" which should take care of my issue.
One correction to the above, you connect one terminal of the transformer to +12v and to the black/violet to the tach, and the other to the tach output of the MSD. This will charge the doorbell coil when the MSD is LOW. Then when it goes HIGH the doorbell voltage will break down and send the pulse up the tach wire.
What is the point of being an electrical guru if you give the wrong advice, I ask myself!
The nice folks at MSD have actually shown this, sorta, in their diagram.
Installed Tach-Adapt & all is OK now. Easy install...yippee!!!!!!!!!!
I too have the Tach-Adapt and it's worked well on my 69 with a 3.2. It was installed by a PO near to the tach, behind the dash.
However, I was under the impression it could go in the engine bay, using the tach wire to send the "corrected" signal to the tach. So I moved it to the engine bay. I could not get it to work -- quite sure I wired it correctly in the engine bay.. I had to move it back to to the front, where it went back to working as before.
Is there a reason this cannot work -- does the signal from the Tach-Adapt degrade over that distance?
Thanks in advance...