tach dash - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Luv68's · 11-10-2003, 08:39 PM

Was lucky enough to buy a 71 gmc w/ a tach dash, but it does not work. I have the original wiring harness and is connected correctly. 12v to the tach and other side to the negative side of the coil. Any ideas??????

70c10 · 11-10-2003, 08:52 PM

Look for breaks in the circuit panel. Just a thought.

**Classic Heartbeat** · 11-10-2003, 08:54 PM

The tach could be broken and need replaced. We have new ones if interested. WES www.ClassicHeartbeat.com

JimKshortstep4x4 · 11-10-2003, 09:36 PM

I would make sure the dash is grounded, 12 volts are at the tach itself, and check the wire to the coil for continuity. Tachs can go bad, but my experience has been good with the tachs, no failures out of the (7) originals that we have and most of them we have had for over (8) years.

Since the tach hooks up directly, the printed circuit would not have anything to do with the tach. We hook our tachs to the "unfused" ignition terminal on the fuse panel.

Jim

Luv68's · 11-10-2003, 10:51 PM

Thanks everyone, I haven't given up yet

Longhorn Man · 11-11-2003, 01:01 AM

Even if the inst panel has a good ground, i would try to ground the tach its self too. Can't hurt if the other wires are all good.

11-10-2003, 08:39 PM	#1
Luv68's Registered User Join Date: Jan 2001 Location: Russellville, Tn and DeLand Fl. Posts: 533	tach dash Was lucky enough to buy a 71 gmc w/ a tach dash, but it does not work. I have the original wiring harness and is connected correctly. 12v to the tach and other side to the negative side of the coil. Any ideas??????

11-10-2003, 08:52 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	Look for breaks in the circuit panel. Just a thought. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-10-2003, 08:54 PM	#3
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,766	The tach could be broken and need replaced. We have new ones if interested. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

11-10-2003, 09:36 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	I would make sure the dash is grounded, 12 volts are at the tach itself, and check the wire to the coil for continuity. Tachs can go bad, but my experience has been good with the tachs, no failures out of the (7) originals that we have and most of them we have had for over (8) years. Since the tach hooks up directly, the printed circuit would not have anything to do with the tach. We hook our tachs to the "unfused" ignition terminal on the fuse panel. Jim

11-10-2003, 10:51 PM	#5
Luv68's Registered User Join Date: Jan 2001 Location: Russellville, Tn and DeLand Fl. Posts: 533	Thanks everyone, I haven't given up yet

11-11-2003, 01:01 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Even if the inst panel has a good ground, i would try to ground the tach its self too. Can't hurt if the other wires are all good.



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