What is this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**rs74** · 11-07-2013, 11:45 PM

I am going through the dash and trying to fix all what previous owners have botched. I cam across this and not sure what it is. My K10 doesn't have this so I am thinking it has something to do with this K30 being diesel. I found it under the left hand side dash under the headlight switch. It was just laying on the backside of the lower dash not hooked up.

joe231 · 11-07-2013, 11:58 PM

Part of the cruise control, I believe

4x4k30 · 11-08-2013, 07:26 AM

Quote:

Originally Posted by rs74

I am going through the dash and trying to fix all what previous owners have botched. I cam across this and not sure what it is. My K10 doesn't have this so I am thinking it has something to do with this K30 being diesel. I found it under the left hand side dash under the headlight switch. It was just laying on the backside of the lower dash not hooked up.

that hooks to the speedometer in the instrument cluster 85-86 models had that your cluster must have been replaced before

**rs74** · 11-08-2013, 10:16 AM

Quote:

Originally Posted by 4x4k30

that hooks to the speedometer in the instrument cluster 85-86 models had that your cluster must have been replaced before

I am about ready to tear the cluster out here in a day or two so I will see what is there. Everything seems to work except the oil pressure gauge but that is an easy fix. The "water in fuel" light stays on all the time. I suppose that is why the PO pulled the bulb out. That might explain why I didn't see it on my K10 since I have not had the cluster out of it. Anyway I will check that out. Thanks.

**rs74** · 11-18-2013, 10:45 PM

Quote:

Originally Posted by 4x4k30

that hooks to the speedometer in the instrument cluster 85-86 models had that your cluster must have been replaced before

Bringing this back to the top. It does screw into the back of the speedo but what is it. The part number is 25007327 but I can't find it when I google the number.

motornut · 11-18-2013, 11:42 PM

if it goes into the speedo it might be the GM VSS Buffer ? Vehicle Speed Sensor VSS

joe231 · 11-18-2013, 11:43 PM

It's an optical vehicle speed sensor that reads the vehicle speed via the speedo.
http://www.rockauto.com/catalog/more...=40855&cc=2796
It's used by the cruise control
http://www.justanswer.com/chevy/6mti...chevrolet.html

86swb · 11-19-2013, 12:03 AM

Is that the one that lets you know you are going over the speed you set?

11-07-2013, 11:45 PM	#1
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	What is this? I am going through the dash and trying to fix all what previous owners have botched. I cam across this and not sure what it is. My K10 doesn't have this so I am thinking it has something to do with this K30 being diesel. I found it under the left hand side dash under the headlight switch. It was just laying on the backside of the lower dash not hooked up. Attached Images __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

11-07-2013, 11:58 PM	#2
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: What is this? Part of the cruise control, I believe __________________ *CHEVY ONLY*

11-18-2013, 11:42 PM	#6
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: What is this? if it goes into the speedo it might be the GM VSS Buffer ? Vehicle Speed Sensor VSS __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

11-18-2013, 11:43 PM	#7
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: What is this? It's an optical vehicle speed sensor that reads the vehicle speed via the speedo. http://www.rockauto.com/catalog/more...=40855&cc=2796 It's used by the cruise control http://www.justanswer.com/chevy/6mti...chevrolet.html __________________ *CHEVY ONLY* Last edited by joe231; 11-18-2013 at 11:51 PM.

11-19-2013, 12:03 AM	#8
86swb Born a Chevy Man Join Date: Apr 2005 Location: Navarre, Florida Posts: 10,221	Re: What is this? Is that the one that lets you know you are going over the speed you set? __________________ John or 86 (Viet Nam combat Vet-BIG RED ONE) '65-'66 1986 Chevy SWB Silverado 1984 Chevy Longbed Silverado New Kia Sportage (Wife's car and she loves it) CHEVY, American made w/pride! If you can read this, YOU NEED TO THANK A TEACHER! If you can read this in ENGLISH, PLEASE THANK A SOLDIER! GOD BLESS AMERICA AND BLESS OUR FIGHTING TROOPS

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