So my 93 hatch is a project and a half. and the speedometer is bouncing all around when im accelerating and when im just coastin its says 0. any clues on how to fix this.

 

does VTEC engage when its not working? (if the vehicle is equipped) try cleaning the vss connector that gets pretty dirty sometimes also the connection on the back of the cluster make sure no pins are loose or recessed if that checks good try this https://honda-tech.com/forums/showth...ht=speedometer
if that dont work try a known good cluster.

 

Very common problem
take his advice^
and youll be good