Tach Spins Backwards!

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Sep 15, 2004 | 08:53 PM

HDFLH67

Thread Starter

Racer

Joined: Jan 2003

Posts: 294

Likes: 0

From: Rochester NY

Tach Spins Backwards!

I'm trying to figure out why my original '75 tachometer spins backwards. If you have original tach wiring, could you please check the color of the two wires to the tach? Is the forward wire black and the rear wire red? Anyone have any thoughts as to any other wiring that might have gotten transposed and caused the reversal?

TIA as always!

Sep 15, 2004 | 09:43 PM

Mike Mercury

Team Owner

Joined: Apr 2001

Posts: 54,204

Likes: 180

From: S.W. Ohio. . . . . . NRA Life Member

best I got right now:

Sep 16, 2004 | 11:31 AM

Dave3

Advanced

Joined: Jul 2004

Posts: 66

Likes: 0

From: Butler Pa

haha, mine does the same. i was at a traffic light, and when it changed i got on it, ran it through the gears. i get into 2nd, rpm's getting to about 4000, i shift to 3rd, and instead of going towards the 0, it falls to the 7000 side!

now when i drive it goes the wrong way....i am now shifting about 6000.... and even that is basically shifting on sound. who really looks at their tach when they drive anyways?! haha

Sep 16, 2004 | 03:55 PM

76greg

Racer

Joined: Dec 1999

Posts: 425

Likes: 1

From: South Elgin, IL, USA

My 76 rests at zero then pegs negitive on startup.

Sep 16, 2004 | 04:39 PM

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,373

Likes: 6,371

From: At my Bar drinking and wrenching in Lafayette Colorado

Make sure your engine isn't spinning backwards and that you're not driving around in reverse.

Sep 16, 2004 | 05:24 PM

jn76vette

Melting Slicks

Joined: Oct 2003

Posts: 2,300

Likes: 2

St. Jude Donor '08

Mine says zero all of the time.

I think the previous owners real name was Bubba

Sep 16, 2004 | 06:18 PM

JOliver

Burning Brakes

Joined: Jul 2003

Posts: 868

Likes: 5

change the circuit board on all of the above,will fix them up.
That tach consist of a fragile circuit board and a coil,coil swings circuit board tells it where to swing.
The newer cicuit boards are alot better,well SOME of them are stay away from the ones Ecklers sell they're junk.

I can help anyone with a Tach problem-email me

Jason
VetteInstruments@aol.com