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#1
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1964 tach inline filter
Just installed an MSD. As described in the instructions, my tach stopped working. the solution in the instructions is to bypass the inline tach filter. For a 1964 A body - does anyone know where that lives and/or what it looks like?
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#2
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An MSD what? Box, dist?
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#3
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Sorry, yes it’s a 6al digital box. Distributor is stock with Petronix. Everything works fine. The tach issue is called out in the 6al box installation, and the remedy is to bypass the inline filter but I don’t know where/what that is...
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#4
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The tach should connect to the MSD box and not the distributor.
The MSD doesn't provide a correct 'signal' for the older tachs. Not sure what the inline filter means? Usually the MSD has its own Tach connection? (never used a digital MSD though)
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#5
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Does it have a wiring diagram with it?
Looked like a grey wire is for the tach output?
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#6
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Thanks John. I think I have the set up right - I did connect the tach wire to the msd box. pretty much followed the diagram I included here. And then also the tach section of the doc. most applications with this issue have a tach adapter that you can use - but for GM, you are supposed to bypass the inline filter if the issue comes up... (they suggest elsewhere in the doc that it does not always come up as an issue)
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#7
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MSD made two tach adapters, #8910 & #8920. I think you might need the 8920.
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#8
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I’ll call msd next week and see what they say. That table in my pic was not totally helpful to gm...
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#9
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I wanted to close this one out- the 8920 adapter from msd fixed it. Tach working again....
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