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Re: installing a tachometer
I'd try taking the power from the fuse going to the wipers. This would be a much heavier fuse than the dash gauges would have plus the wiper fuse will only be live when the ignition is at the "ON" and "ACC" positions.
Now for another suggestion that hasn't been mentioned yet,
If you're truck isn't fully loaded with options you may have extra openings for fuses in the fuse block. If you use a meter you may find some open slots that only have power when the key is on. If this is the case then it's OK to add a fuse there and tap off of it if need be. To keep costs down auto manufactures use the same main wiring harness whether or not a vehicle has certain options. The wires just don't have anything to connect to (left unplugged at the accessory end) and the fuses are left out.
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2006 Maryland Delphi "Driving Tomorrow's Technology" award
2006 Connecticut General Motor's Industrial Design award
2005 Finalists-----------New Jersey (along with our alliances again, 56 & 303)
2005 WINNERS of the Radio Shack Innovation in Control Award (not once, but twice!  )
2004 WINNERS ------ Johnson & Johnson Mid-Atlantic Regional (also thanks to our alliances 56 & 303)
2004 General Motors Industrial Design Award Winners
2004 Archimedes Quarterfinalists (also thanks to our alliances 121 & 386)
NEMO _________ NonEngineering Mentor Organization
"Make it idiot proof and someone will make a better idiot!" - author unknown
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