Cadillac Repair: 92 eldorado, test procedures, starting from scratch

Question
92 Eldorado with a 4.9l the temp and fuel display [d] it has a service engine soon, antilock brake and service ac light on this care was given to me today and have no history on it. starting from scratch.

Answer
If you are mechanicaly inclined or know of someone who is, You will need a DIGITAL MULTIMETER, Simple electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture. I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.