Here I will sum this up...as some have already stated, if you have the new digital speedometer that is GPS, that needs to be re-wired so that it is " keyed hot". There is a Red, a Black and a Yellow. Take the yellow wire and move it to where the red wire is and it will then be all keyed hot.
If you dont have one of those and the battery is draining, always go to the aftermarket stuff that was added. Aftermarket fuel gauges are notorious for draining batteries, pull the ground wire off is the simplest way to check.
Hope this helps.
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