I've heard a lot of guys had issues with the Lunar Series. IIRC, there's something about our trucks that just doesn't mesh well with the Lunars and causes them to crap-out prematurely. Most post I've read sugest Auto Meter will take care of you, but since the Lunar Series has been discontinued they will replace it with the NV Series. If they replace it for you, ask for the Phantom Series... then you can do the blue bulb/green condom mod. IMO this is the most similar gauge to the OEM cluster.
Bruce I sent my bad Lunar trans temp gauge back last week. Today a new Lunar trans temp gauge was drooped off by UPS. Now thats customer service
No cost to me except postage to sent it to Autometer.