1995 to 1998/99/00 Instrument Cluster Information...

[Physh1]

Seems there are a lot of threads about the OBS clusters, what can be done to change them, and what the difference are between them. I've had this on my website for a while but not too many know about it so I'll post everything here. Hopefully this can be made a sticky for the interior forum. I may even do a info faq for the NBS clusters if the interest is there. I will also add any info that may come up that would be a good addition to this info post.

I WILL BE ADDING A TECH FEATURE ON HOW TO SWAP YOUR STOCK ODOMETER INTO ANOTHER CLUSTER YOU WANT TO INSTALL IN YOUR 95+ OBS TRUCK.

Below is a picture of the common 100 mph cluster found in a majority of 95-98/99/00 OBS GM trucks and suv's...


(picture credit to James B.)

Below is a picture of the 120 mph cluster found in 99/00 OBS Escalade, Denali, and Tahoe Limited suv's...


(note the stock clear needles!)(picture credit to James B.)

Last but not least, here is a pic of the 130 mph Special Edition Police Tahoe Cluster..


(picture credit to James B.)

The sweep on the 100 mph cluster and the sweep on the 120 mph cluster are the same. These are interchangeable and require no modifications for proper function and speed readings. However, the Police Cluster is a different story. Here is a pic of the 130 mph sweep versus the 100/120 mph sweep...


(picture credit to James B.)

The Police Cluster can be identified in a few other ways besides the 130 mph sweep. The Police cluster has an identification on the printed circuit and also has a unique circuit board specific to these clusters. No other stock OBS cluster have this and to run this cluster this board requires wiring and calibration. Boosted Z-71 has accomplished this swap and he has informed me of how to do it. You can read his information below.

The cluster is a straight bolt in except in the case of the speedometer function. You'll need to use a Dakota Digital signal modifier to take the stock speed signal and modify it AFTER it went through the ECM and out on its way to the speedo. You'll also have to shield the wires really well at the signal box and all connections or you get some RF interference that causes the speedo needle to jump at times. Some have recommended splicing into the speed sensor wires at the tranny. Do not do this! You talk about messed up shift points, that will give it to you. By modifying the signal after the ECM and on its way out to the speedometer you get transmission shift functions that stay normal and the ALDL scanner data is also correct. All you need is a scan tool and keep adjusting the Dakota Digital box to match your needle to your ground speed on the Scanner. Mine is accurate to within less than 1 mph, from 0-130. The only other way to do this is change the reluctor in the tranny & GM would not sell the police pacage reluctor to me without trading in a similar unit.


(picture credit to James B.)


(picture credit to James B.)

Like I mentioned earlier, the 120 mph clusters found in 99/00 Escalades, Denali's, and Tahoe Limited suv's can be a drop in replacement upgrade for the standard 100 mph clusters found in 95% of OBS GM trucks from 95-98/99/00. As you can see the cluster backlighting is a teal color versus the green backlighting found on the stock cluster. Just another subtle difference along with the clear needles.





Cameron

[Sweet Tea Man]

article cam

[Jim]

this article has been added to FSCU!

Thanks Cam!

http://www.fullsizechevy.com/fscu/

[Physh1]

Cameron

[Ross]

The OBS Escalade/Denali/Tahoe Limited clusters are almost impossible to find, right? Can you purchase one from the dealership?

[Ryan98948]

Here is another OBS Cluster.
Note this cluster is made for trucks with real transmissions

[Ryan98948]

Originally Posted by Ross

The OBS Escalade/Denali/Tahoe Limited clusters are almost impossible to find, right? Can you purchase one from the dealership?

I asked a friend of mine who works at a local dealership he said that they cost mucho $$$$, but they can get them in.

[Physh1]

Originally Posted by Ryan98948

Here is another OBS Cluster.
Note this cluster is made for trucks with real transmissions

How is that one any different...looks like a stock cluster like I have posted. What do you mean by "Note this cluster is made for trucks with real transmissions".

Cameron

[Physh1]

Originally Posted by Ryan98948

I asked a friend of mine who works at a local dealership he said that they cost mucho $$$$, but they can get them in.

GM discontinued production on them but some are still in wherehouses and in dealers. If you can find them and want them they will cost a good amount.

Cameron

[LS6TT]

that cluster is for the Standard tranny, which some people call "real transmissions"

[Williamts99]

Originally Posted by LS6TT

that cluster is for the Standard tranny, which some people call "real transmissions"

And what is the difference in the cluster?

[DirtyBlackHoe]

man I wish someone on this forum (physh) would have one that I could buy off him! hehe...seriously I need to find one of those for my tahoe and swap in some blue leds.

[Williamts99]

Yea, I would love to have a 130mph speedo.

[454_72_4X4]

Originally Posted by Physh1

GM discontinued production on them but some are still in wherehouses and in dealers. If you can find them and want them they will cost a good amount.

Cameron

Just curious, If a person found a used Denali 120mph version, How much could he expect to spend?

I just noticed the 120mph version is the only one that has a redline.

[99bluetahoe]

If anyone have been looking for an esky cluster for OBS, found one on ebay:

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

[96LoLyfe]

Originally Posted by Williamts99

And what is the difference in the cluster?

nothing really different in the cluster other then it doesn't have the gear indicator at the bottom of the speedo.....

i have a '96 silvy ecsb and mine came stock with the 120 mph speedo......guess i just got lucky......

[454_72_4X4]

Here's one can be bought for a one hundred dollar bill plus shipping!
PM me....

[traviz71]

what about the '95 cluster that only goes to 5 grand on the tach? orange line at 4000 and red line at 4500

[Physh1]

Besides the lower redline on the tach there are zero differences that I have found.

Cameron

[some1else]

Originally Posted by Physh1

Besides the lower redline on the tach there are zero differences that I have found.

Cameron

The range is different too, not just the "red line."