You won't want the gauge on at all times, so wiring it to the ignition wire at the radio would be better. I doubt it's really seeing 5V with the key off, but just to check you might want to get out a voltmeter, it should read zero.
You need to wire it to a +12 switched live, sounds like you have tapped it into the wrong wire.
:wallbang: hate it when cables have been choppedExactly that, though I found an ignition source it was the wrong one. All sorted now - thanks for the reply :thumbup:
If only the person who installed the stereo didn't chop off the white loom plug it would have all been very easy. I therefore had to cut the white plugs of my gauge cablesand of course got the problem of marrying up the right wires :wallbang:
it should be on zero with the ignition set to off
hows the search for the sender going?![]()