7K 73-87 tachs

[Littletony]

Homemade87,
did you have to change anything to run the tach and fuel gage setup?

[homemade87]

Originally Posted by Littletony

Homemade87,
did you have to change anything to run the tach and fuel gage setup?

I used a reg cluster. You do have to remove the lower warning lights. You have to cut out the housing to get the new assembley to sit in there.Not a big deal to cut it out. Here is a thread with some good info on this topic. http://67-72chevytrucks.com/vboard/s...d.php?t=470240 .

[nekkidhillbilly]

i wonder if you can have these converted from mech to electric

[1985-GMC]

They are electric, do you mean convert them to mech?



Here's the writeup on how to fix a stock one: http://www.howtoalmanac.com/kevin/pr...chfixtruck.htm

[nekkidhillbilly]

They are electric hmmm
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[Telecasterjoey]

Originally Posted by 1985-GMC

I fixed my tach with some help: http://www.gm***************/forum/s...ead.php?t=2281

Edit: ^ that is supposed to say "gm square body. com" with no spaces

http://www.howtoalmanac.com/kevin/pr...ve/tachfix.htm

I Can't believe I got the old tach I had laying around working! I looked at your post and thought I'll give that a shot on my blown tach.

went to the electronics store got the potentiometer came home put it all together and couldn't believe it! the tach never came close to working before. I'd hook it up and it would just bury the needle. I had an autometer tach laying around and I was able to tune the stock one to match. What a badass idea! I cant believe more ppl don't know bout this mod. Even if your tach works you could add the potentiometer to dial it in!

I couldn't get the pot to lay flat enough on the circuit board to seat the tach into the plastic properly so I just glued it to the back of the tach face and ran some wires to it. I love my cluster now its got everything! Clock and tach Ps. I got the tach a year ago at the junk yard and was super bummed when it didn't work.

Sorry for the crappy pics my garage is dark and I only had my phone camera.




Thanks a lot man!

[MalibuSSwagon]

That looks great joey! I dream of the day I find one in the junkyard.

[Telecasterjoey]

I think they're pretty scarce in 1/2 ton trucks I started looking for those big c 50 monsters.
I found one so far.
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[1985-GMC]

Sweet! Its all thanks to Kevin who made the How to Almanac, I just shared the info here for other people to see. Im glad someone else got there's fixed, I imagine every factory tach out there needs this done weather it works or not.

[motornut]

Originally Posted by Telecasterjoey

I Can't believe I got the old tach I had laying around working! I looked at your post and thought I'll give that a shot on my blown tach.

went to the electronics store got the potentiometer came home put it all together and couldn't believe it! the tach never came close to working before. I'd hook it up and it would just bury the needle. I had an autometer tach laying around and I was able to tune the stock one to match. What a badass idea! I cant believe more ppl don't know bout this mod. Even if your tach works you could add the potentiometer to dial it in!

I couldn't get the pot to lay flat enough on the circuit board to seat the tach into the plastic properly so I just glued it to the back of the tach face and ran some wires to it. I love my cluster now its got everything! Clock and tach Ps. I got the tach a year ago at the junk yard and was super bummed when it didn't work.

Sorry for the crappy pics my garage is dark and I only had my phone camera.




Thanks a lot man!

that looks great in there

[Chevyman350]

I Contacted Wilcox and the truck board is 88.00.

Due to the their expernece with truck parts vendors not expressing intrest in carying this part.

Here is the link.

http://willcoxcorvette.com/product_i...ducts_id=27330

I will buy one for sure but I was hoping LMC, classis industries, etc., would want to carry a part like this?

Oh Well

[1985-GMC]

Cool, I couldn't find the link to it. That's a little more than I would have hoped for but still better than having it sent off to get fixed.

[nekkidhillbilly]

on this you think one of the gauges companies could make a 140 version of the oem speedo

[1985-GMC]

There was a company on ebay that was selling them already done like that but I can't find anything about them now.

Just get a Canadian 140 version and rub off the KPH.

[nekkidhillbilly]

well if i could get it to work right but its still gonna be needle wrapped around to like 23 all the time lol.

[54Caddy]

Found me a tach today at the junk yard. Got the whole cluster for 25 bucks. I put the posative and negative on the battery and confirmed that it went to zero now to test it conected to the HEI. I see that the aftermarket one that JKnight bought got the power and ground from the small fuel gague would i be able to do this with a stock unit? Which side of small fuel gague is power and ground?

[1985-GMC]

Did you get the tach harness with it?

[motornut]

Originally Posted by 54Caddy

Found me a tach today at the junk yard. Got the whole cluster for 25 bucks. I put the posative and negative on the battery and confirmed that it went to zero now to test it conected to the HEI. I see that the aftermarket one that JKnight bought got the power and ground from the small fuel gague would i be able to do this with a stock unit? Which side of small fuel gague is power and ground?

I used power from the pink black and grounded to the hub @ the ebrake , no probs
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[54Caddy]

Yes i got the tach harness with it. Im just trying to get it wired without having to run long lengths of wire, thats why i wanted to get power and ground from fuel gauge, also i want to know if there is a way i could test temp, and volt gauge outside of truck before i install them just to verify they work. The cluster is out of a 77 mine being a 79. i want to move over the brake warning light to the speedometer housing, since my truck is not 4wheel drive i could just swap over the plastics but which wires would have to be moved in the pin of harness?

[motornut]

Originally Posted by 54Caddy

Yes i got the tach harness with it. Im just trying to get it wired without having to run long lengths of wire, thats why i wanted to get power and ground from fuel gauge, also i want to know if there is a way i could test temp, and volt gauge outside of truck before i install them just to verify they work. The cluster is out of a 77 mine being a 79. i want to move over the brake warning light to the speedometer housing, since my truck is not 4wheel drive i could just swap over the plastics but which wires would have to be moved in the pin of harness?

have a look is the right side of the seat belt one not brake?
this swap should work

[joe231]

Does any one have any experience with a factory diesel tach on a 6.2 diesel engine?
How did the factory run the tach on the big diesels?

[1985-GMC]

It should be the same, just 4K instead of 5K.

[Corts60]

Originally Posted by joe231

Does any one have any experience with a factory diesel tach on a 6.2 diesel engine?
How did the factory run the tach on the big diesels?

Was that you I just got into a bidding war with on ebay over a 4k NOS tach? I am so bummed I didn't win that.

[joe231]

Originally Posted by 1985-GMC

It should be the same, just 4K instead of 5K.

Same as what?
Diesels don't have ignition coils...

Anyone know if the factory tachs will run of the alternator?

Originally Posted by Corts60

Was that you I just got into a bidding war with on ebay over a 4k NOS tach? I am so bummed I didn't win that.

Nope
Not me
Lol
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[Jonboy]

I ordered the GM Sport Salvage one a few minutes ago. Hopefully it will work in the '91 cluster.