We sure do not need certs for use of an attitude indicator in our trucks. No reason to pay full money for one.

The wideband can do a fine job of keeping the mixture in a preset range. I do like it's readout for future monitoring of function.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.