'92 Speedo Recalibration - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-29-2003, 01:03 AM   #1
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Default '92 Speedo Recalibration

Replaced instrument cluster with a rebuild a few years ago. This corrected all my fluctuating oil pressure, fuel gauge, etc. but..........

Before the replacement my idle showed about 750 rpm. After replacement idle showed about 1,000 rpm. A Tech II confirms I AM idling at 750 rpm.

Is there some adjustment/calibration screw on the cluster that will enable me to adjust the rpm back down to its actual 750 rpm?
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Old 05-29-2003, 10:24 AM   #2
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Did you get the right cluster..? Year - Style?
Because sometimes they are set to read voltage differantly..
So maybe you got the wrong one?
Other then that I believe there isnt a way to set this.
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Old 05-29-2003, 03:51 PM   #3
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Default Re: '92 Speedo Recalibration

Quote:
Originally Posted by compyelc4
Is there some adjustment/calibration screw on the cluster that will enable me to adjust the rpm back down to its actual 750 rpm?
Nope. It'* a mathematical calculation of pulse counting over time, and a step motor that the controller drives to put the needle at a certain point on the dial. Something'* funky in there, all right, but I don't think there'* any adjustment you can make, short of going in and replacing things. I dunno _what_ things, either...
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Old 05-29-2003, 10:12 PM   #4
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Default Sounds dumb, but ....

I had the same problem with mine ...To fix it, I pulled the clear lens off the instrument panel, and popped off/reset the needle to point exactly at '0' with the key on, engine NOT running. Just be careful, as there is a small clear paddle on the opposite side of the pointer shaft from the pointer arm, and the engine has to be stopped in order to be able to pull it out of the panel (the paddle fits through a notch in the panel itself). Since then, it hasn't been an issue, and it appears to be staying accurate now .... Some may frown on this idea, but it worked in my case. Just my .02 ....

Brian J
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Old 05-29-2003, 10:30 PM   #5
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What ever works I suppose I cant think of anything else...
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Old 05-29-2003, 10:39 PM   #6
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Thank you for the responses Ruskybear, Gearhedd, and ACG!

Hey ACG, sounds like my kind of "jury-rigging".

Can't remember- can I get the clear lens off w/o total removal of the cluster assy?

How difficult was it to pull the needle off? What tool did you use?

Explain this comment again, please "a small clear paddle on the opposite side of the pointer shaft from the pointer arm". Do you mean the clear paddle is on the inside of the instrument cover plate, while the pointer is on the "outside"?
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Old 05-30-2003, 11:42 AM   #7
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Quote:
Can't remember- can I get the clear lens off w/o total removal of the cluster assy?
Yep.... You'll need to remove all the trim pieces associated with removing the cluster, but the lens itself is removeable with the cluster still fastened in place. See the posting in the 'Tech Info' section on how to get the trim off...

Quote:
How difficult was it to pull the needle off? What tool did you use?
I just used my fingers to pull the pointer off. It is pressed on a tapered shaft, so it kinda sticks at first, but it will come loose/off with a bit of insistent pressure.

Quote:
Explain this comment again, please "a small clear paddle on the opposite side of the pointer shaft from the pointer arm". Do you mean the clear paddle is on the inside of the instrument cover plate, while the pointer is on the "outside"?
Exactly. The actual body of all the pointers is clear, with a grey plastic cover over the hubs. The paddle is opposite the pointer itself, and it kinda acts like a fiber-optic "conductor" that picks up light from the instrument panel bulbs, and sends through the hub and down the length of the pointer. The pointer itself is also clear (it'* all one piece), with just the back surface painted orange to reflect the light that is being passed through it. Anyway, like I said, the paddle picks up light from the panel bulbs, and the panel cover plate has a notch for this paddle to fit through when it is being pressed on the shaft. In case you have any other pointers that are inaccurate and you want to fix this way, I'll give you a list of where the pointers must point in order for the paddles to align with the notches. Please note that this listing is for an SSEi - SE'*, SSE'*, SLE'* may vary depending what gauges they have, and on whether they have a Boost Gauge or Voltmeter - Mine has the Boost...

Going L to R on the Panel -

Tachometer - 0 RPM (Key on, engine OFF)

Speedometer - About 60 - 65 MPH (I set mine while driving smooth and level road with
the HUD/cruise on, took SEVERAL tries !!!!)

Fuel Gauge - Empty (Key on, tank empty, or key off) I set mine to the top of the orange
area when my "check gauges - fuel warning" first came on, but you
have to remove it with the key off(it sits at Empty), and
guesstimate how much to move it. Might not be worth messing
with.

Temperature - 100 (Key on, Engine COLD)

Oil pressure - 0 (Key on, Engine OFF)

Boost - 0 (Key on, Engine OFF)

Hope this helps some, let me know how it goes....

Brian J
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Old 05-31-2003, 12:25 AM   #8
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Thanks Gearhedd. I'll give her a try this weekend.
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