How do i reset the SERVICE RIDE CONTROL message that comes up every time i turn on my truck once i've made sure the shocks and compressor are in good shape

If the warning light is coming on for more than a minute, it should be setting a trouble code in the body computer for the problem that is occuring at the time. You may want to have someone check the body computer for trouble codes next.
The compressor would run if the system looses air pressure or if a load is added to the truck.

Check and make sure that the level control lever that goes to your shocks was reconnected. Might have been overlooked....Hope this helps.

Have you reset the ecm with a scan tool? Just changing the parts wont clear the problem code.

the kit should have instructions on how to bypass that message., if not call the Mfg of the kit.

Off the top of my head the following may be the case for your 1995 Cadillac Deville based on my 1997 Cadillac Deville knowledge:

gear indicator fault- has to do with the shift lever sensor down on the column by the feet,

service ride control- has to do with the air ride shocks in the back or the compressor in the front or the ride control height,

change oil soon- has to do with not resetting the % oil life (just press reset button for a few seconds when the oil % life is displayed)

Hope this helps you out.

Electronic Brake Control Module,
I really don't understand why they would change this module if your message stated,Ride control,
The ride control on the tahoes is an airbag (air powered shocks) leveling system. If I remember right, they are only in the rear. They are meant to raise or lower the rear end to be level with the front end. To do this, it has air shocks in the back, which are controlled by a computer and a compressor probably under the hood. Now, the light could mean many things, the most common being that an airbag broke, and air is leaking out. You may be able to hear a whine of the compressor trying to keep it filled. Less common, but possible are that the compressor is dead, or a line ruptured. The most common reason that the air shocks go out, are when the vehicle is lifted (tire change or such) without the leveling system being deactivated. Hope this helps. Good luck.

check youer air shocks for leakes and rear hight sensor

That is an indication that your air shocks at the rear needs to be replaced or there is a sensor that may have gone bad, event the air pump mey not be working. Most owners replace the more expensive air shocks with good conventional shocks like Monroe Reflex Shocks if there not towing heavy trailers. You can have the conventional shocks installed and have the ride control system deactivated. First check your fuse just t make sure the fuse to the air compressor has not gone bad, and the air ride leveling sensor, wire harness has not been damaged due to corrosion. 

The fuse is called RTD 30 amp under the hoodfuse box. That is for the Air Compressor.

Parts.com has the best price for:

Rear Suspension:
Shock W/auto level control - 1500 series

and under
electrical:
then ride control components
then compressor

A ton of things could be wrong with your autoride system. If you have more than about 70k miles and haven't replaced the rear shocks ($500+ EACH!!! at the dealer), then they are probably leaking out. If they leak out, then the air compressor will always run. Eventually the air compressor/ride level sensor module (located on the driver side rear wheel on the inboard side of the frame, $300+ at the dealer) burns out because it's not designed to run at 100% duty cycles. After the air compressor burns out, the Electronic Stability Control module (in an XL, located inside the passenger side rear wheelwell trim, next to the third row seat, $300+ at the dealer) will probably short out. If your autoride isn't working and you don't get a "Service Stability" message, your ESC module is probably going bad.

It is possible to convert to regular shocks, but to keep the Stability Control (still has to control your brakes and front variable dampening shocks during "evasive" maneuvers), you have to insert some 1/4 watt resistors in to the ride height sensor connectors (can't remember what values, but I'm sure you can Google that) so that the Stability system doesn't throw a code. Not that it matters, but the message can get annoying if it's always there to nag...

My dealer quoted over $2500 to replace the entire system. I figure I can find the control modules from my local junkyard for $300, and the shocks from ebay for $350 for the pair. Be sure to match all of the GM part numbers, and keep an eye out for an upgraded Air Compressor module - GM released an update that is heavier duty and more water-resistant than the first design. I don't remember the part number, but my dealer included the upgrade with my quote.

Oh, and the only "easy" way to test the modules is with a Tech 2 tool. Otherwise it's lots of testing with a 12-volt source and a couple of multimeters and oscilliscopes...

Good luck!