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porschevw
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Joined: October 30, 2005
Posts: 85
Location: Pace, Fl.
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 Posted: Thu Aug 25, 2011 9:26 am Post subject: 914 tach wiring |
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I have a '74 914 and p.o "played" with the wiring to the tach. I can't seem to figure this out. Can anyone tell me how the tach is hooked up. I put a tach in my baywindow westy and all it needed (if I remember right) was power, splice into the dash lights, and run a wire to the negative side of the coil.
Thanks,
Jon |
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type47
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Joined: April 19, 2007
Posts: 21
Location: Vienna, VA
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mtwrench540
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Joined: October 25, 2009
Posts: 352
Location: monterey,va
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| Posted: Sun Sep 04, 2011 5:50 pm Post subject: tach |
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what about ground?
_________________
87 wolfsberg,74 181w/1915 and lots of patina! learned to fix vw's from hot vw mag in 1964,VWOA instructor,DSM,69 to73,service mgr at different porsche-audi dealers etc,etc,now retired!!! first vw new 64,transplanted 356 eng in 65,400characters are not enough space!! |
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boxcar
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Joined: July 23, 2008
Posts: 17
Location: North NJ
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| Posted: Fri Aug 10, 2012 3:18 pm Post subject: NinefourteenTach |
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It is a nice addition albeit BIG...
I am wiring up an Electromotive XDI/Cranktrigger unit.
I ran an old 914 tach before triggered off C(-)
Electomotive manual describes this "some older tachometers trigger off the high voltage signal from the ignition coil (c-). These type of tachometeters require the use of a tach amplifier....designed to trigger off a 120 volt signal."
Trying to figure out what the (-)side of the coi is putting out?
Just a 12v pulse? Or 120v as the manual describes...the FI picks up a pulse here also, and i looked but saw no test values in the EFI sticky(nice to have this!!)
Anyway, I bought an amplifier already so I am just confirming theory before i start stripping wires...thanks |
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mtwrench540
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Joined: October 25, 2009
Posts: 352
Location: monterey,va
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| Posted: Fri Aug 10, 2012 4:27 pm Post subject: tach |
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there only three connections that you need,#15 to ign source,#31 to ground,and last wire(i forgot #) to point side of coil,green wire!
_________________
87 wolfsberg,74 181w/1915 and lots of patina! learned to fix vw's from hot vw mag in 1964,VWOA instructor,DSM,69 to73,service mgr at different porsche-audi dealers etc,etc,now retired!!! first vw new 64,transplanted 356 eng in 65,400characters are not enough space!! |
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