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Old 09-29-2011, 10:20 PM   #1
C15_Sierra
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Join Date: Apr 2011
Location: Hartford CT
Posts: 223
Electric speedo question

Hey guys - I snagged a Burb/Blazer electric speedo for my 5.3 swap a while ago and I'm getting around to installing it in my cluster - I noticed in other pics that when installed there is a box behind the cluster - is that the calibration box? I bought the speedo off eBay, and it did not come with the box.

Questions are:
1) Am I right in assuming that's the calibration box? Or is it for the cruise control like the ones on mechanical speedos?
2) Where can I get a calibration box?

Speedo in question:


Circuit board for the speedo with 4 pins, presumably to go to the cal box:


Thanks for the help
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-Steve

1980 GMC C15 Sierra LWB
Dark Carmine Red/Carmine Int
Was: 250/3spd (1980-88), then a 305/TH350 (1988-2011)
Now: 5.3/4L60E, 2.73 12-bolt open rear
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