88 300e temp gauge,not sender
 

well i grounded temp gauge at sender and no response on dash.
i tried search but did not find what i wanted, some were close.
so it looks like dash gauge needs to be pulled.
so far i have this, ground temp sensor wire at motor,no response on dash, but when key is turned on, dash temp gauge gives a slight bump,so power? is getting to it. is this gauge fixable by itself or do i need to send the cluster out?
will my 88 190e gauge cluster work in 88 300e?
doing this with the help from this forum can really save time and agro
thank you Rich