The aftermarket may be a problem, they design these so they can't be removed without a "special tool" that is provided when the head unit is bought.
I'd try to either find the tool for that specific unit either by the manufacturer, ebay, or a local store. If not, then carefully try to either pry from the front, or push out from the back. BE CAREFULL, I put an aftermarket in my '92 Tempo GL and made sure I left hardly any room so if anyone tried to steal it, they would have a really hard time getting it out. Just yanking the thing outta there doesn't always help, good luck.
you take the head off and take all the valves off
At least 4 hours or more.
Most aftermarket stereos will work.
take it to a dealer
I had an 88 Tempo and the purpose of each fuse was marked on the fuse block. Take a closer look.
I want to say no, because the tempo has a bigger transaxle than the escort.
with "ford radio removal tool"
You don't take one out....it has to be programmed out with an aftermarket chip for the ECM.
Not enough - cranking it up for extended periods shouldn't damage it, but the distortion from the head unit will probably roast the factory speakers quite nicely. Don't mess with it unless it's to take it out and go aftermarket.
Take it to Best Buy
youtube com/watch?v=dQw4w9WgXcQ
You should have great luck shopping for these Nike shorts over at Amazon.com. Head over, take a look, and see if the size/ style/ color is available at the price you are interested in paying.