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Tach on 1.6D???
by
Tmarkle
on 24 Mar, 2017 10:02
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So I tried to wire in an Autometer tach to my VW, I bought a new alternator from NAPA (old one was bad) and it happened to have the W terminal, so I thought, sweet! I can wire in a tach! well I tried to wire it in and for whatever reason the tach goes from 0-4k rpms on startup and doesnt look like its moving properly... Ideas???
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#1
by
burn_your_money
on 24 Mar, 2017 10:51
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Do you have a proper signal from the W terminal? I think you're looking for 8 VAC.
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#2
by
Tmarkle
on 24 Mar, 2017 13:18
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Do you have a proper signal from the W terminal? I think you're looking for 8 VAC.
Honestly didn't check. I'll test it and see.
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#3
by
libbydiesel
on 24 Mar, 2017 14:49
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Is the Autometer tach for a gas engine? If so, it will not work with the W terminal.
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#4
by
vanbcguy
on 24 Mar, 2017 18:35
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Is the Autometer tach for a gas engine? If so, it will not work with the W terminal.
...at least not without an adapter.
As you've noticed the alternator signal is much higher frequency than a gasser ignition signal which is what that tach is expecting.
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#5
by
Tmarkle
on 24 Mar, 2017 18:47
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Is the Autometer tach for a gas engine? If so, it will not work with the W terminal.
...at least not without an adapter.
As you've noticed the alternator signal is much higher frequency than a gasser ignition signal which is what that tach is expecting.
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Where would I get such an adapter? Yes it's for a gasser, I bought it for another project and thought I would utilize it for this car.
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#6
by
vanbcguy
on 24 Mar, 2017 18:48
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Dakota Digital make the only adapter I know of that's premade. I've never had to use one.
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#7
by
Tmarkle
on 24 Mar, 2017 19:19
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Dakota Digital make the only adapter I know of that's premade. I've never had to use one.
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Could one make their own adapter?
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#8
by
vanbcguy
on 24 Mar, 2017 19:36
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There's a few examples around the forum where people have used a magnetic pickup and a magnet or two attached to the IP or cam pulley to trigger a gasser tach.
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#9
by
libbydiesel
on 24 Mar, 2017 19:56
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There are quite a few tach options available:
Get a stock diesel tach for your model and run it off the W terminal.
Get a stock gasser tach for your model and replace the necessary components to turn it into a diesel tach and run it off the W terminal.
Add an inductive probe and a couple lugs to drive a gasser tach off the crank.
Get a Tinytach and run it off a piezo pickup on an injection line.
Get an optical sensor kit from 4crawler and run a gasser tach off it.
Get the Dakota Digital signal conditioner and run a gasser tach off the W terminal.
I've personally done the first three options and they each can work fine. I like the stock tach look so tend to go that direction. There are probably other options that I'm forgetting.
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#10
by
Tmarkle
on 25 Mar, 2017 12:48
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Ok thanks I'll see what I can figure out!