Just a word of advice you guys probly melted your ecus if ya did not pull the positive cable during this install. And another note is dont believe everything you read you should always use 88-89 civic parts with 88-89 civic swaps and 90-91 civics the same. I have a buddy that did the same thing in his 90 hb dx with my 89 hb si cluster and he now has a new ecu because of this.
BTW a 90-91 tach cluster can be used in a 88-89 civic but there are a few wires that need to be changed and also with 88-89 to 90-91 but yes this could short your ecu if these mods where not preformed...sorry for the bad news guys
