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Spawn

620 Gauge Cluster LED Conversion

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I'm posting this link here, as I don't know if anybody really gets notifications for changes in the How-To section of the Forums.  If an admin or moderator deems that this should not be here, please feel free to remove it.

 

Edited by Spawn

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Ok, well, either nobody is clicking the picture link to get to the post and comment there, or nobody has the information.  So I'm gonna do my best to try and remove the instrument cluster, but my only concern is with regards to the Wiper Washer switch.  I'm guessing that the knob for the switch pulls off like most other friction fit style knobs, but I'm unsure about the silver ring that rests against the cluster plastic.  It has a groove on each side of the ring, so I'm thinking that you have to use a special tool to remove it (or perhaps a pair of needle nose pliers opened just wide enough will allow me to place the tips of the pliers into each groove and then I can just unscrew it like a regular screw)?


Can anyone who has experience removing the Wiper Washer switch or the Light switch (as I believe it is the same sort of fastening mechanism for it) please let me know exactly how to remove it without wrecking the ring, cluster or switch itself?  Judging from the picture below it seems like the silver ring just screws on over the shaft to hold each of the switches in place, but the ones on my 620 seem to be extremely tight.

001.jpg

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Pull the switch all the way out and grip the stem as close to the dash as possible, tightly. Now push in on the knob and turn and release, and it comes off.

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17 hours ago, datzenmike said:

Pull the switch all the way out and grip the stem as close to the dash as possible, tightly. Now push in on the knob and turn and release, and it comes off.

So it's basically like one of the push and lock style bulbs?  What about for the silver ring with the notches in it?  Any tips or hints on how best to get those removed without wrecking anything?

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Probably finger tight. Maybe some soft jawed pliers to get it started.

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Well, I managed to get the instrument cluster out of the truck... in pieces.1To4i3I.jpg

To be fair, it was already cracked in a few spots, and was fairly brittle.  There was only one screw holding the bezel up just above the tachometer blankoff (but it didn't seem to be holding on to anything as there is no shoulder for the screw to hold against the plastic), and there was the screw holding the bottom of the gauges to the dash frame.  Other than that, the only thing was the wiper washer switch (which came off rather easily after datzenmike provided the information on how to remove the knob - Thanks datzenmike!) and the lighter socket (which I did not figure out was simply a casing screwed on around the socket itself).

Luckily, due to the damage that the instrument bezel had when I got the truck, I had already managed to get a spare bezel (a little lighter in color, but in much better shape), so I cleaned it up and installed the components in it.  Just need to get the LED bulbs now!

BY4uKAP.jpg

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Well, on my continuing quest to get the gauge cluster converted over to LED bulbs, I made up this image of the rear of the cluster along with each of the bulbs that were removed.  I have marked up where each of the bulbs come from to make it easier for others in the future.  Once I've gotten the replacement LED bulbs figured out, I will edit the image with the appropriate information.

One thing that does have me a little confused/stumped is that for the images that I have seen of other gauge clusters is that I have an additional box or module of some sort on the rear of the speedometer, just to the side of where the cable gets fastened onto the speedometer.  Also, I have two wires with bullet style connectors that I didn't unplug when removing the gauge cluster, one blue and one green.  I've looked into the cavity where the cluster gets installed in the dash, but I only see a blue wire with yellow stripe on it.  I'm not sure if this should be where the blue wire plugs in or not, and for the green wire I haven't found a male opposite for this to tie in to.  Due to the fact that I didn't have to unplug either of these wires when removing the cluster, I'm not even sure if either of these wires should be plugged into anything at all!  The only thing that I can think the box/module might be for is to reduce oscillations in the speedometer gauge needle.  If anybody happens to know what the module is for, I would love to know, as it seems to me that without having the green wire from the module plugged in I don't think that the module is getting a ground (as green is typically used for indicating grounds in wiring).  As for the blue wire, I can't tell exactly where it goes to, as it's just coming out of a grommet hole on the top of the gauge cluster in between the two gauges.

b7SjHzd.jpg

Edited by Spawn

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That module MAY be an overspeed indicator. There was one of those on a speedo I bought out of Canada. Lights up a light when you go too fast. Unused in my dash now because I don't have the corresponding light.

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