Gauges for Air/Fuel ratio and Tranny temp. who's got 'em

[lt1vert]

I've seen those small led boxes for the air/fuel ratio and I think I want one. What's a good brand and how hard is it to install?

Same with a transmission temp gauge. With the torque converter and shift kit, I get worried when I'm on a spirited drive that the tranny will get too hot. How do I install a temp gauge for that?

thanks

 

[Ken]

^^^