Originally Posted by jeepers creepers
Unfortunately i've no A/F meter here.
I'm not familiar with a 'Howell EFI' system, but I would find it hard to believe that it wasn't designed to be used with either a narrow or wide band 02 sensor (A/F meter same as AirFuelRatio gauge.) I recommend an Innovate LC1, but there are others are out there that work also.
EFI without AFR gauge is like marriage without sex - what's the point -
Can you datalog with the Howell system?