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02-05-2010, 03:19 PM
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#1 |
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S.D.M.F.
Join Date: Jan 2007
Location: Westport, In
Posts: 639
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Tach Help??
So ive been wanting to add a tach in my truck for a while now. I was gonna buy one from autozone or napa or somewhere and mount it woth my other gauges. Do i get a mechanical one? If so how and where do u hook it up. If i get an electrical one how do u hook it up???
Im just curious to see what my trucks rpm is when im hauling stuff or driving on the highway.
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1969 Chevy Longhorn 396/400 3/4 ton.  1991 Chevy Camaro RS 305/700r4 1978 Honda XL175 and XL350(the evil twin)  2006 Kawasaki ZX-14r drag bike-best e.t. 9.4@145 mph without nitrous 1971 BSA Thunderbolt 650cc
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02-05-2010, 04:08 PM
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#2 |
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Registered User
Join Date: Sep 2005
Location: Reno, NV
Posts: 161
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Re: Tach Help??
Need more info. HEI or points? Either way, the red wire goes to a 12v source thats only on when the ignition is on (DONT hook it to your coil though), the black wire is ground, and the green wire goes to the negative side of the coil on points ignition, and on HEI it depends on the distributor but most of them have spot to hook up the tach next to the power wire. some aftermarket tachs have a white wire which is for a light, you just hook that into your dash lighting. hope that helps.
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1970 GMC 4x4 swb fleetside custom 4 inch lift with rear shackle flip, mild sbc, tci trans, rebuilt np205 w/twin shifters |
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02-08-2010, 02:21 PM
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#3 |
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S.D.M.F.
Join Date: Jan 2007
Location: Westport, In
Posts: 639
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Re: Tach Help??
Electronic ignition is in it now
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1969 Chevy Longhorn 396/400 3/4 ton. 1991 Chevy Camaro RS 305/700r4 1978 Honda XL175 and XL350(the evil twin) 2006 Kawasaki ZX-14r drag bike-best e.t. 9.4@145 mph without nitrous 1971 BSA Thunderbolt 650cc
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02-08-2010, 02:25 PM
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#4 |
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Registered User
Join Date: Jul 2006
Location: Central PA
Posts: 12,201
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Re: Tach Help??
the tach will have instructions... mechanical tachs are rare...
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The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 02-08-2010 at 02:26 PM. |
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02-08-2010, 03:07 PM
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#5 |
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Account Suspended
Join Date: Dec 2008
Location: indisclosed
Posts: 1,515
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Re: Tach Help??
1) i wasn't aware of anyone that makes a mechanical tach? Can anyone provide a link.
2) For a rough guide for right now as far as installing an electrical tach, check out these links, which i, in my usual style, tried(unconscienciously) to make it as anal(detailed) as possible: http://www.chevytalk.org/fusionbb/sh...hp?tid/183547/ http://forum.73-87chevytrucks.com/sm...p?topic=8374.0 If you get the electric tach, these guys can walk you thru it (while i watch) or i could probably walk you thru it step-by-step(with intervention from others here) as i like to get anal and learn more about electricity. It's not that hard once you do it once and understand the theory behind the wiring. |
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02-08-2010, 04:17 PM
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#6 |
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S.D.M.F.
Join Date: Jan 2007
Location: Westport, In
Posts: 639
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Re: Tach Help??
Oh so u can only buy them electronic then??
Just type it on google and some people sell them
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1969 Chevy Longhorn 396/400 3/4 ton. 1991 Chevy Camaro RS 305/700r4 1978 Honda XL175 and XL350(the evil twin) 2006 Kawasaki ZX-14r drag bike-best e.t. 9.4@145 mph without nitrous 1971 BSA Thunderbolt 650cc
Last edited by longhorn396; 02-08-2010 at 04:18 PM. |
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02-08-2010, 04:34 PM
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#7 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Tach Help??
Mechanical tachs are old school, and require a special distributor with a gear drive to run them.
Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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02-09-2010, 12:22 AM
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: Tach Help??
 Mechanical tachs were used in the older Vette's and in racing applications. As mentioned above you have to have a tach drive distributor and run a drive cable (like a speedo cable) up to the tach. You really don't need a mechanical tach, just get an electric one, they're much simpler.
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02-12-2010, 03:56 PM
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#9 |
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S.D.M.F.
Join Date: Jan 2007
Location: Westport, In
Posts: 639
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Re: Tach Help??
I just thought they were like the ones on my motorcycles lol. my bad
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1969 Chevy Longhorn 396/400 3/4 ton. 1991 Chevy Camaro RS 305/700r4 1978 Honda XL175 and XL350(the evil twin) 2006 Kawasaki ZX-14r drag bike-best e.t. 9.4@145 mph without nitrous 1971 BSA Thunderbolt 650cc
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