Printerstu

Hi all.
I had a problem that my cluster and window fuse blew every time, i found after alot of hours that it was the diode behind the fuel gauge dial on the cluster. The diode was burnt out so couldn't see any information on it so i replaced with another similar sized diode but now my gauge when full only shows 3/4full and hen empty goes 1/4 past empty. Can anyone tell me what the original diode was? i did try the FSM but no info there. and do you think this related?

thanks
Stuee