Here's a weird one (or maybe not so weird). I decided to replace the car's tachometer, which has not worked right as long as I've had the car. Unfortunately, the new tach had a minor problem that I wanted to get fixed before installation, and the seller agreed to footing the bill to have it sent to Palo Alto Speedometer, where it currently is. (More on this episode in a later thread.) I had already removed the old tach and elected not to replace it; since I didn't plan on running at high revs anytime soon, I could drive the car fine without any tach. (Eventually I put the old one back just to fill the hole!) I pushed the panel the speedo and tach mount to back into position but didn't reattach the screws. Now, everything else is working fine with one notable exception: at night I have no instrument lighting at all, and that includes the three gauges in the center of the dash! The gauges themselves are still working fine, except, of course, for the disconnected tach. Here's one other point: the indicator lights embedded in some of the gauges are still working properly! This includes the turn-signal indicators, the lights-on indicator, the low oil-pressure light (briefly at startup) and the low-fuel warning light. So why do these lights still work, while the gauge back-lighting does not? Does the lack of a hooked-up tachometer have anything to do with this? Or the fact that the central panel is not attached with screws? Oh, yes, the fuses are fine.