i have a 89 civic sedan, d15b2 all stock. when the engine is running and warm, the needle is fine but if i turn my lights on, signal lights on, hit the brakes, anything to do with power the temp needle moves up and down? Could it be a short somewhere, head gasket, what is it, its pissing me off?? How can i fix it? any advice or comments could help.

 

lol not yer head gasket. just short circuits. my car does it too. i wouldn't worry too much about it. yer guage prolly reads accurate when yer lights are off.

 

i might have the problem fixed. im pretty sure ground clamps were not in the correct spots

 

let me know exactly what you did lol. then i can fix mine.

 

i fixed it!!! ok it was the ground clamp. i put oe on the chassis witch was correct and the other i put on the tranny, but the tranny is aluminum and aluminum does not conduct electricity so i mooved it to the block and all my problems were solved