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if the overdrive light is flashing this means you have a transmission problem and a fault code has been set.
you need to plug in with a scan tool to get the fault code. also check the transmission fluid level.
if your car has good oil pressure and the oil pressure light comes on you will need to change the oil pressure switch
let me know if you need more help
THANKS FOR THE ANSWER. I'LL NEED A LITTLE TIME TO CHECK OUT THE CODES. THE VEHICLE IS AT ANOTHER LOCATION AT PRESENT. I'LL HAVE TO RUN OUT THERE A LITTLE LATER.
Here is some information on reading the transmission codes.
click here to view procedure
let me know how it goes