France arrive in Cardiff next Sunday with Wales searching for a first Six Nations home win in four years.
The calamitous state of Welsh rugby means the WRU are struggling to sell out their three home games this year, with thousands of tickets still available for next weekend.
Tandy hopes Wales will receive the usual home backing.
“The fans have been amazing support for the team,” said Tandy.
“We know what it means to the boys to play in the Principality Stadium and the fans give them huge belief.”
Whether the Wales head coach will make changes remains to be seen as he balances reacting to an underwhelming display and the need to develop a settled side.
He says there would be no “knee-jerk reaction” and full-back Louis Rees-Zammit appears to have done enough to keep the number 15 jersey.
The former NFL triallist was making his first Six Nations appearance for almost three years and is settling into a new position after switching from the wing.
After a shaky start where he had an early kick charged down, Rees-Zammit settled down and produced one searing second-half break.
“He did well in his first start at 15 in a while for us,” said Tandy.
“In Test match rugby, there’s not much space but I thought he adapted with the aerial battles.
“He’s a big man and lit the game up in moments. It’s looking how we can get more of those moments.”
So maybe one thing for Welsh fans hold onto. There is currently not much more.