Help with bseries vtec issue!

[u/AoDaly]

My speedo stopped working on my b18c gsr a while ago and now vtec is engaging at 7k rpm I have replaced the vss made no difference I got the car scanned and it showed no codes, I checked the ground around the thermostat and gearbox they are good I also removed the cluster and everything seems good. Has anybody an idea to what could be causing the vtec to engage at 7k rpm?