brand new autometer tach is junk?!?!?!

U

UnderdogGN

New Member

May 7, 2006

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May 27, 2007

#1

• May 27, 2007

• #1

hey guys, just bought a brand new autometer pro comp 3.75" tach.....theres only 4 wires coming out of it....i read the directions a thousands times and it doesnt work wtf!?!?! green wire went to my MSD ignition box tach terminal, black went to the negative side of the batter, red went in to the fuse that has 12V power when the key is on, and white went to the lights. The light in the tach works fine but when i fire the car up the tach needle just sits where it has been sitting and doesnt move....anyone got any ideas or did i just waste $150 on a brand new junk autometer tach!?!?!
thanks in advance

 

jtfairlane

New Member

Mar 5, 2006

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May 27, 2007

#2

• May 27, 2007

• #2

Are you 100% certain (not just making an "educated" guess) that the tach is receiving ignition hot, switched 12v?

 

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UnderdogGN

New Member

May 7, 2006

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May 27, 2007

#3

• May 27, 2007

• #3

im pretty sure because i put a test light where i hooked into....it lit up when the ignition was on and turned off when i turned the ignition off....ive tried it in two different spots like that

 

795.0pacecar

lover of pudgy polygamists

Jul 11, 2003

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Senoia, GA

May 27, 2007

#4

• May 27, 2007

• #4

Have you tried running the signal wire straight off the coil?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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May 27, 2007

#5

• May 27, 2007

• #5

The multiple sparking will cause the tach to read incorrectly if run off the coil, but I suppose you would see that it works at all.

I'd recheck the connection on the box for the tach hook-up. Then, as mentioned, use your meter to confirm that you have 12 volts into the tach and that your ground is good (implied if you daisy-chained the ground wire for the illumination, but double check).

Good luck.

 

S

smr

Member

Nov 14, 2005

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Nor*Cal (Vacaville)

May 29, 2007

#6

• May 29, 2007

• #6

x2...A friend just went through three new tachs thinking he bought junk but it wound up being his msd wasnt putting out any tach signal...

 

MustangMatt1966

New Member

Mar 11, 2004

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Orlando Fl.

May 29, 2007

#7

• May 29, 2007

• #7

smr said:

x2...A friend just went through three new tachs thinking he bought junk but it wound up being his msd wasnt putting out any tach signal...

Click to expand...

ding ding ding...also check to see if the tach is switched to V8 mode..some have 4/6/8 settings i think. I cant exactly remember if that was for my shift light or for the tack...but check and make sure... I think the tach is working properly, but it is the connection to the coil that is keeping the tach from working..let us know what it turns out to be.

Matt