tach dash in

[tommys72]

It's in and looks good, I have to get a new circuit for it though, none of the gauges work after I put put back in and only one light lights up
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[tommys72]

Can some of you guys gimme a pic of where you have your tachs plugged in on the fuse panel please

Thanks in advance
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[jjzepplin]

Does the tach work? And congrats... only 9,277 miles on your truck-sweet.

[HIGHWAY BY THE SEA]

That tach sure looks good! I want one for my 1968 C10. I just found a full set of gauges (no tach) in a junkyard and I want them, but am not sure if $50 is a good price.

[TBONE1964]

That is looking good sir. You might want to just double check the ground and the plug in again if you have not yet. If that does not work, try a separate ground wire directly to the tin on the back of the cluster to a known good ground.

[TBONE1964]

Originally Posted by HIGHWAY BY THE SEA

That tach sure looks good! I want one for my 1968 C10. I just found a full set of gauges (no tach) in a junkyard and I want them, but am not sure if $50 is a good price.

I would not pay to much over $25.00 unless it is really nice. Will they refund your money if the gauges are not working? You will need to invest in new bulbs also.

[71K20chevy]

I got the repo harness from Classic Parts, I think it was $20.

It's got the plug for the back of the tach, the one that plugs into ign. unfused on the fuse panel, and the plug that runs through the firewall to the coil.

[tommys72]

Originally Posted by jjzepplin

Does the tach work? And congrats... only 9,277 miles on your truck-sweet.

Nothing works right now, except the light bulb for the speedo. That's the original gauge, I have to assume thats 109,277
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[tommys72]

Originally Posted by TBONE1964

That is looking good sir. You might want to just double check the ground and the plug in again if you have not yet. If that does not work, try a separate ground wire directly to the tin on the back of the cluster to a known good ground.

Thanks buddy, she's a work in progress
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[tommys72]

Ok fellas, I got the tach to work and the one dash light, but nothing works now. .. what could it be?
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[TBONE1964]

Originally Posted by tommys72

Ok fellas, I got the tach to work and the one dash light, but nothing works now. .. what could it be?
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I am not 100% sure on this but I think you should have a gauge fuse in the fuse panel. Have you tried to wiggle the electrical connector behind the cluster while the truck is running to see if anything happens? If it all worked before then it has to be something like a connection problem, ground, or bad fuse.

Which one dash light works? never mind, i read your prior post. Speedo light correct? Does the bright light indicator or the turn signal indicators work?

[tommys72]

Originally Posted by TBONE1964

I am not 100% sure on this but I think you should have a gauge fuse in the fuse panel. Have you tried to wiggle the electrical connector behind the cluster while the truck is running to see if anything happens? If it all worked before then it has to be something like a connection problem, ground, or bad fuse.

Which one dash light works?

Speedo light is the only one working, just drove it, speedo and tach work and the one light. I messed with connection earlier and got nothing. Im gonna check the fuse and then pull it al all back apart if I need to
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[jjzepplin]

What cluster did you used to have? You can't switch from idiot lights to gauges without some rewiring.

[tommys72]

First pic is all original, second pic is with the new to me tach and tin and whatnot
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[tommys72]

Could the circuit be doing all this
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[TBONE1964]

Originally Posted by tommys72

Could the circuit be doing all this
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Tom,
Do you have an OHM meter? can you check resistance between the circuit board paths. That will tell you if something is burned out. Most of the time you can see when they burn out. Also, do you have a 12 V test light and can you check power at the connector. You should have power for the dash lights, the turn signal indicators, the bright light indicator, the amp/volt gauge.

Have you downloaded the wiring schematics or do you have them available? That will help you pin point what terminal is for what.

Sorry you are having problems. I know electrical stuff can be a pain.

[71K20chevy]

While the circuit board doesn't look the greatest, I don't see any obvious spots.

You might try cleaning up the contacts and seeing if that helps.

[tommys72]

I cleaned up everything a little bit when I had it apart just now. Putting it back together right now. I do have a test light...but I didnt even think to use it....
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[tommys72]

So I took it back apart cleaned it up a bit, made sure everything was good and tight. Now the tach, speedo, oil pressure gauge and all dash lights work. Just fuel, battery, and temp gauges aren't working. Gonna try some fuses today as my last guess, or a new printed circuit. Any one have any other guesses?
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[TBONE1964]

Sounds like you are on the right track Tom. All of those gauges you mention should be powered by the gauge fuse in the fuse block.

Use your test light and make sure the fuse has power on both sides. You will need to have the ignition in the on position to check this.

[tommys72]

Originally Posted by TBONE1964

Sounds like you are on the right track Tom. All of those gauges you mention should be powered by the gauge fuse in the fuse block.

Use your test light and make sure the fuse has power on both sides. You will need to have the ignition in the on position to check this.

Ok I'll do that. Thanks Tom
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[71K20chevy]

Make sure the wire didn't get disconnected at the fuel sending unit!

[tommys72]

Originally Posted by 71K20chevy

Make sure the wire didn't get disconnected at the fuel sending unit!

I'll get a look at it, didn't know about it coming undone
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[tommys72]

I give up for now. .. replaced some fuses, made sure again the connection was in good. Only thing I can figure now is its the printed circuit. Guess I'll have to give a new one a try now
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[Andy4639]

Looking at this picture it looks like the upper 2 are 3 connections are missing and maybe some lower ones to. The circuit is cut off and looks like it may not be making contact with the plug once inserted.