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 Kent
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| posted on April 28th, 2013 at 01:30 PM |
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Fitting Tachometer
Hi alll
i have purchased a Tacho and was wondering if anyone has installed one themselfs?
if they could give me any tips that would be much appreciated.
also i need to find a postive sourse that is turned on and off with the ignition? i dont have a multimeter on me so i need a bit of a hand with
that?
cheers
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Anthiron
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| posted on April 28th, 2013 at 01:37 PM |
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Green wire to Negative Coil terminal
Red wire to power source which is live when key is in On position (Wire it from the ignition switch)
black or brown wire to earth
Then you will have 2 more wires for the backlight.
Red wire to headlight circut
black wire to earth.
Usually they come with an instructional booklet. If the wire colours are different, just substitute the colours on your tacho (It should have a wiring
diagram in the booklet)
Nicko
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1974 Chevrolet Luv
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Kent
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| posted on April 28th, 2013 at 01:44 PM |
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Cheers Nicko.
i need to extend a few of the wires to reach the coil/battery, will need to use exactly the same size wire?
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Anthiron
A.k.a.: Nicko McKay
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| posted on April 28th, 2013 at 02:09 PM |
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Just use 12 gauge wire.
You won't need to wire the Tacho directly to the battery. Just to a power source that is live when the ignition is ON. IE: the ignition feed terminal
on the ignition switch.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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Joel
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| posted on April 28th, 2013 at 08:31 PM |
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Just be careful of where you run the signal wire from the coil to the tach.
If it ever rubs through and grounds on anything metal the engine will stop.
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vlad01
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| posted on April 28th, 2013 at 10:59 PM |
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| Quote: | Originally
posted by Joel
Just be careful of where you run the signal wire from the coil to the tach.
If it ever rubs through and grounds on anything metal the engine will stop.
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is that from experience?
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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psimitar
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| posted on April 29th, 2013 at 12:32 AM |
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and don't power the tacho straight from the ignition switch. Always run things from the fused side of the fusebox.
Either have a look at the wiring diagrams for you year here The
Samba Beetle wiring page
or if you aren't good at reading wiring diagrams let us know what year Beetle you have and we can tell you the fuse to connect too 
madness is in the eye of the beholder  |
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Anthiron
A.k.a.: Nicko McKay
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| posted on April 29th, 2013 at 05:24 AM |
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Psimitar is right. I should have mentioned. Run an in- line fuse.
| Quote: | Originally
posted by psimitar
and don't power the tacho straight from the ignition switch. Always run things from the fused side of the fusebox.
Either have a look at the wiring diagrams for you year here The
Samba Beetle wiring page
or if you aren't good at reading wiring diagrams let us know what year Beetle you have and we can tell you the fuse to connect too
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62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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hellbugged
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| posted on April 29th, 2013 at 06:06 AM |
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| Quote: | Originally
posted by vlad01
| Quote: | Originally
posted by Joel
Just be careful of where you run the signal wire from the coil to the tach.
If it ever rubs through and grounds on anything metal the engine will stop.
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is that from experience?
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Yep
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Joel
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| posted on April 29th, 2013 at 06:52 AM |
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| Quote: | Originally
posted by vlad01
| Quote: | Originally
posted by Joel
Just be careful of where you run the signal wire from the coil to the tach.
If it ever rubs through and grounds on anything metal the engine will stop.
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is that from experience?
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Nope, I've always used factory wires in the loom for tach signal (72 on have them for the diagnosis circiuts) but anyone who knows electrical can
tell you that grounding the points will kill the ignition.
Same reason I laugh everytime I see a thread on a VW forum why does my engine stall every time I put the car in reverse? 
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psimitar
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| posted on April 29th, 2013 at 11:16 PM |
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no I'm sure the reverse power goes to the coil negative
madness is in the eye of the beholder |
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Kent
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| posted on May 4th, 2013 at 03:28 PM |
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I got the guage it in and works fine 
thank you all for your tips !
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SunshineKarmann
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| posted on May 6th, 2013 at 01:28 PM |
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If you find that your tacho reading is off and/or the needle is a little jumpy, you can wire up a diode in line with the negative wire from the coil
(place diode closer to the coil end) to stop the signal rebounding and creating these issues. Worked a treat with mine.
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Joel
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| posted on May 6th, 2013 at 04:13 PM |
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It's just a simple recifier diode, it can go anywhere in the line.
I started out fitting them at the coil too but the harsh enviroment of an engine bay gets to them eventually.
I started fitting them at the tach end and they were fine, no one has reported back any problems yet.
Most tachs these days are designed for a nice clean signal from the ECU not the fluffy one points provide.
An IN4004 diode cleans the signal up nicely.
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