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Gauges, stepper motors, and 85mph speedos

Old 12-04-2008, 08:28 PM
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Default Gauges, stepper motors, and 85mph speedos

So here is my dilemma, I have the factory square dash in my 93 Blazer. tach is good for 5000rpm, speedometer is good for 85mph. needless to say, this isnt going to cut it for a stock LS1, let alone one with a turbo.

I already have a gauge face designed and figured out, now I need to change how the stepper motors work. How do I go about this? change or add resistors? Different stepper motor? I reallllly want to stick with a factory-looking cluster instead of going to autometers or something similar.
Old 12-04-2008, 09:57 PM
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You should be able to program the PCM to send a differant pulse rate to the speedometer to correct it. There is no stepper motor in the tach, its a straight meter movement, if i remember those dashes correctly. Why don't you just convert it to the digital dash for that year, its a fairly easy swap and the speedometer will display past 150 MPH, if i remember correctly it starts blinking out at around 180.
Old 12-04-2008, 10:30 PM
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I agree, I'm not as concerned about the MPH as I am the tach. I'm pretty sure I can take care of that by messing with HP tuners. as far as digital dashes, even if they had them for the Blazers (NOT S-10 blazer, we're talking real blazer, aka fullsize) I cant stand digital dashes. dakota digital makes one for the fullsize thats a plug and play, but again, i'm not into digitals, even tho they look awesome.

here is the cluster style we're looking at.
Old 12-04-2008, 10:38 PM
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There is a cap on the back of the dash they change to change the range, but if your driving it from an LSX PCM it should only read half scale to begin with. So when it displays 2 grand, it should really be 4 grand
Old 12-04-2008, 10:56 PM
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hmmm... how do I change that signal output?

I guess I could put 10k where the 5 is but that would look kinda tacky.
Old 12-05-2008, 05:32 AM
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Do you have any tuning software?
Old 12-05-2008, 12:13 PM
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Yes, HP Tuners.

I may have avoided the whole problem, just bought what is supposed to be a 454SS cluster from a salvage yard in texas, if it is, there is my 6000rpm tach and 110mph speedo. I can handle that for driving daily, any track duty and I'll have the laptop opened up beside me.


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