Del Sol Russell

I have a 93 s 1.5L I was having problems with the speedometer then bought a couple used vss problem still wasn't solved. Bought a new VSS (m) like the original one same prob. bought a 95 si cluster 105k mi. Seemed to read better but still would work only some of the sime. Is doesn't give me and accurate MPH like its weak. The tack problem seemed to be solved when I put a jdm grounding kit. I was hoping it would improve the volts going to the speedometer as well but didn't . I read another similar forum sayin to buy a new cluster but where do u get one? and are there cool aftermarket options?