tach stopped working! any opinions...?

[mheinjr]

Today my tach stopped working. I didn't get a chance to check to see if there is any volts comming from the MSD or not. The lights work the preset shift light works. When I start the car the arm on the tach shakes a little but than doesn't move. Is it the tach or do you think the MSD box isn't sending any power?

Thanks

[5150 LX]

HMMM, if all else fails try wiring it up temporarily w/o going directly into the MSD.

I can't get the damn lights to work on mine but I think I may have forgot a ground wire when I put the damn dash all back together.

[mheinjr]

I will do that to test it out... Where do I connect it? To the distributor somewhere?...

Thanks

[5150 LX]

according to Autometer's site the green wire from the tach hooks to the neg side of the coil.....But I'll be damned if I can recall which color wore off the coil is negative, lol.

[mheinjr]

hmm I hooked it to the + wire on the coil and it goes up to 4000 rpm's at idle I guess thats the wrong term....

[mheinjr]

nah the negative term. didn't do anything I guess it is the posotive term. I guess I would need a tach adapter to do that or somthing. But anyway now I am certain the msd box needs to go back for that to be fixed. I already called them and they said thats nothing and there were a few that came back for that, but thats cheap to fix.

[5150 LX]

It's the neg side as per autometer's website (PDF File)

If it was the MSD then the tach would work when connected to the (-) side of the coil, no adapter is needed I just spliced into mine prior to my msd intall.

I'd double check the wiring for the entire tach.

[mheinjr]

hmm this doesn't make any sence...

1: when connected to msd box "does not work" "used to but not now"

2: when connected to + term of msd coil "not stock" "it works, but isn't right" "it says I idle at 4,000, and it moves when I give it gas"

3: when connected to - term "does not work at all" "same as when connected to msd box"

Someone on the corral has the same problem, and they said it was the msd box.

Now I don't understand why it works on + "not correctly", and doesn't work at all on the -


GOD, and this really don't make sence cause I read the pdf and it says -........ well tomarrow is sat. so I guess I will mess with it in the daylight, but now I really think it is the tach...

[5150 LX]

Hmmm ya got me there, lol

[mheinjr]

I'm going to go over my wires tomarrow, but I really don't think it's the wires. I think the tach itself isn't taking the signal in. I am going to call Auto meter tom. "there probubly not open", and I am going to call them monday and get ready to ship back after I speak with them about it.....

This sucks.... hehe