I have just put another 4age engine into my ae82 and it purred like a kitten for a frw weeks however the battery i had in it was farked and (don't ask me why) but i tryed starting it quite a few times on the farked batt, i have since tryed the batt out of another car(fully charged and in good working order) and now the rolla work start via the key... It will start when i roll start her but it runs poorly and i have noticed that the tacho(in dash one) behaves weirdly(shows less revs when i rev it) it also when engine is stoped and i go to start her i have noticed that the engine light and oil light are dim as i turn keto pre start position... I am thinking i might have damaged the ecu from trying to s atart her with a farked batt... Any ideas ??? Maybe a bad connection or a fuse or am i right with the ecu?