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carguy4
Samba Member
Joined: May 05, 2015
Posts: 67
Location: Tucson, AZ
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 Posted: Sat May 21, 2016 10:16 am Post subject: Tach Install |
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I am in the process of installing a tach in our '74 coupe and would appreciate some help in the wiring to the coil. The directions for the tach state it must not touch a positive connection, therefore I am assuming it would go to the negative side of the coil. The question is which is the negative side of the coil in the attached picture? I am assuming it is the left side with the green wire. The black wire on the right goes to the top of the distributor and the green wire on the left goes to the capacitor at the base of the distributor.
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OLD VW NUT
Samba Member
Joined: February 23, 2011
Posts: 2776
Location: High Desert of Washington 98823
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| Posted: Sat May 21, 2016 10:43 am Post subject: Re: Tach Install |
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Terminal '1' is ground and terminal '15' is the positive voltage ignition wire.
_________________
71 Ghia Coupe - stock body - no rust! Powered by a 2110 W/Dual HPMX 44's - Rancho Pro Street Transaxle - A/C by Gilmore
Other car - 2013 VW Golf TDI |
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rcooled
Samba Member
Joined: September 20, 2008
Posts: 2504
Location: Santa Cruz, CA
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| Posted: Sat May 21, 2016 11:27 am Post subject: Re: Tach Install |
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Attach the tach's signal wire to the same side of the coil where the green wire from the distributor points attaches (terminal #1). The tach needs to see the frequency of the ignition points opening & closing...that's how it measures the engine RPM.
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'63 Ragtop (current)
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carguy4
Samba Member
Joined: May 05, 2015
Posts: 67
Location: Tucson, AZ
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| Posted: Sat May 21, 2016 11:36 am Post subject: Re: Tach Install |
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Thanks, appreciate the feedback............  |
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carguy4
Samba Member
Joined: May 05, 2015
Posts: 67
Location: Tucson, AZ
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| Posted: Sat May 21, 2016 1:06 pm Post subject: Re: Tach Install |
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| Well, the tach is wired up and works, however, the needle bounces all over the place. What does that mean? |
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SoCalJes
Samba Member
Joined: November 02, 2011
Posts: 1093
Location: Broward, FL
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| Posted: Sat May 21, 2016 1:13 pm Post subject: Re: Tach Install |
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| carguy4 wrote: |
| Well, the tach is wired up and works, however, the needle bounces all over the place. What does that mean? |
It means your muffler bearings are loose!  KIDING 
It would help if you said what kind of tach you're connecting. Some aftermarket Tachs have a 4, 6, 8 cylinder switch you need to set.
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Jesse
71 Ghia
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Just because it didn't come that way, doesn't mean it shouldn't have. |
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carguy4
Samba Member
Joined: May 05, 2015
Posts: 67
Location: Tucson, AZ
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| Posted: Sat May 21, 2016 2:40 pm Post subject: Re: Tach Install |
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| SoCalJes wrote: |
| carguy4 wrote: |
| Well, the tach is wired up and works, however, the needle bounces all over the place. What does that mean? |
It means your muffler bearings are loose! KIDING
It would help if you said what kind of tach you're connecting. Some aftermarket Tachs have a 4, 6, 8 cylinder switch you need to set. |
It is an aftermarket tach made by RPM, and it does have switches in the back, which I have set to 4 cylinder. Probably one of those things you get what you paid for...............  |
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OLD VW NUT
Samba Member
Joined: February 23, 2011
Posts: 2776
Location: High Desert of Washington 98823
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| Posted: Sat May 21, 2016 7:41 pm Post subject: Re: Tach Install |
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Check your points gap.
_________________
71 Ghia Coupe - stock body - no rust! Powered by a 2110 W/Dual HPMX 44's - Rancho Pro Street Transaxle - A/C by Gilmore
Other car - 2013 VW Golf TDI |
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KGCoupe
Samba Member
Joined: July 01, 2005
Posts: 3580
Location: Putting the "ill" and "annoy" in Illinois
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Rich62ghia
Samba Member
Joined: September 01, 2012
Posts: 147
Location: Wollongong, Australia
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| Posted: Mon May 23, 2016 4:30 am Post subject: Re: Tach Install |
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| I had this same problem when I fitted a new VDO tach. Seems they dont make em like they used to. I installed a diode as suggested in the performance engines & transmission threads and it worked, tacho is now as steady as a rock. I installed the high frequency version of the diode they recommend, I think it was UF4002 rather than 1N4002 |
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ZENVWDRIVER
Samba Member
Joined: November 07, 2008
Posts: 3340
Location: N.E. Oklahoma
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| Posted: Tue May 24, 2016 6:08 pm Post subject: Re: Tach Install |
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... got this tach from a local salvage for 10 bux ... they said it's from a 4 cylinder Pinto... connected the wire to the coil, same way... works great.
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bluedot
Samba Member
Joined: April 25, 2013
Posts: 439
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| Posted: Sun May 29, 2016 10:29 pm Post subject: Re: Tach Install |
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Have you seen these monster tachs that ISP west is selling? I just put one in my ghia.
Love it! Shift light, looks like my stock gauges.
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