Well i cant tell you exactly what it is because to do the property diagnostic, id have to be there in person to tell you the exact problem. but what i do want to tell you is DONT buy a new transmission computer. who ever told you that either is just guessing or just wants to get money out of you. the tcu when bad does not allow your transmission to shift. the gas gauge and speedometer just seems to me as you need to replace your instrument cluster. either that, or your speedometer and your fuel pump connections went out at the same time. but i would bet on the instrument cluster. as for the a/c, i cant imagine it jumping, only the rpm dropping a little bit as it does pull in extra power, either way, take your car to different mechanics and get their opinions. hope this helps. goodluck
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