The more popular and safer mod to do would be to buy an entirely new gauge cluster out of a wrecked neon that had a tach. SRT and Tach clusters are direct swaps into neons with no tach (I've got an '03 SE with an '03 SRT-4 cluster). One downside - your mileage won't carry so your cluster will read the milage on the car it was removed from.
Crutchfield sells a kit that allows you to install a single din aftermarket stereo where the pocket under the A/C controls are located.
Did you ever find out the problem? I'm having the same issue.
Absolutely!
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The easiest option in the world would be to visit Best Buy or a local car audio store and buy a wiring harness for your vehicle. They are typically priced between $15-25. It will connect directly to the factory harness and MOSTLY match up color for color on the end that wires up to the aftermarket stereo. If in doubt have a professional install it.
There really isn't one anymore. The instrument in the dash is just a stepper motor, which gets a signal from the PCM. You will need an adapter from a tach manufacturer to hook up any kind of aftermarket gauge.
I don't think any OEM alarms have a 'valet switch.' To the best of my knowledge, that is something only found on aftermarket alarms...
There is an aftermarket tool "dipstick" that can be purchased online. It rolls up and can be kept under seat. Around $50
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I do not know how much it would cost to have a factory sunroof installed by a dealer, but I expect it would be a lot more than a a respectable body shop would charge to install an aftermarket one
Some models require strap mount across the rear fender to mount custom or after-mareketseats.
18" wheels will not fit correctly with the stock struts. The tires will hit on the strut perchs. Aftermarket struts will be needed.