I have a temp gauge that is hooked up, at the temp sender... yet does not work.  There is a ground wire, with a grey cover over it... when I ground it,  the needle swings all way up.  Is the temp gauge hot at the bottom or the top..?  Also since that  brown wire is probably a ground.. where in the circuit.. would cause the gauge to either be all way to the top or bottom.?

Sorry if this makes no sense... I notice in the Bentley is gives a brown black wire to ground..?

Lyle Lathem
1985 Vanagon GL