Yellow with green stripe? Not green with yellow stripe?
wonky upshift light and engine light make me think something went wrong with the vss during the install, like it was shorted to ground or something. I cross checked all the leads on a mpguino here and the lowest was 50kohms (i.e. the first table here
Mpguino tests - EcoModder ) if you want to check that. Might it have been put on something metal or otherwise the vss wiring come in contact with ground?