I am looking to buy either a dx48t or dx95t

Best way to check your SWR is with a separate SWR meter installed between the radio and the antenna. Be sure to check the input and output sides of the meter. With the meter in-place, key up your radio and adjust your antenna for max output / minimum loss. This may require that you change the length of your antenna and repair any questionable connections. Also, be mindful of the fact that CB radios broadcast in AM. That means your antenna should be well grounded to your vehicle. AM radios rely on "ground plane" antennas, which means that your entire vehicle (with good grounding) becomes apart of the antenna system. Hope this helps.

is it on CB not pa. Is the squelch all the way to the left and the RF gain all the way to the right, and the AF power wide open.Do you have the volume up.If you answered yes to all these thenyour internal speaker isn't connected or its no good.Is your external speaker plugged into the ext or pa connection?

the needle wont move on mod until u talk into the mic its for modulation . If the finals were bad the needle wouldnt move at all or very little.

some of the best.

is your dimmer switch turned on or off.

Clamp on front mech xt or xtr would be an option, be careful if you need bottom pull or top, cut or grind off bracket on old front mech to reinstall,as this is a spacer as well as a mounting bracket ,bit old school but older front mechs are best

www.cbtricks.com has your service manual and good luck.

The only issue you have is locating a new motherboard and making sure it works with the 5200 processor. There are literally 100's of motherboards that will do just that. INTEL, ASUS and even AMD make some to name a few manufacturers. Your best best is to look on their sites and locate the motherboard you like that meets your needs then look on dealer sites to locate the best price and have it shipped. Best buy, Office max, Tiger Direct are just a few of the stores that will ship the product and most have on-line live chat options so you can be sure. Make sure you match the RAM capability and Hard Drive connections to the products you currently have. For instance, if your current system uses DDR ram make sure the new board does as well.

Possibly this one will help you.

http://www.tasco.com/products/manuals/novice_30060403.pdf

or one from here:
http://www.scribd.com/doc/11827347/Tasco-Telescope-Manual