Started with this:

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After taking apart the cig-lighter voltmeter i got from ebay ($13 shipped) I measured and cut the hole in the switch blank and glued the display in behind it. Its powered off the purple wire leading to the hazard switch. It is a little bright but im looking for some tinted plastic or a bit of window tint i can slip in between the display and the switch blank. I just used a bit of glue to hold it on (contact adhesive) so it wont be hard to separate them again...
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