Depending on what you want to monitor...

Autometer is the most common brand. There are others like VDO too. Try a search for Automotive Gauges on google and you will find some that suit you.

As for me, I have the Autometer Ultra lIte Series in my truck and they tie in well with the "titanium" faced gauges in my instrument panel.
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Jeb aka Ag Bullet
2001 Frontier S/C CC
www.nissanfrontier.net
My Ride
Most of the world's problems can be solved with blunt head traumas.