[supremeefi]

You'll get as many opinions on this as people have you know what.

I'll suggest the Accel, not because I sell them (you can get them other places as well obviously) but because of some neat features and it's first rate accuracy.

I attached an independent test that shows how much more accurate the Accel DFI is than the Innovate LM-1. The NTK is a lab grade and the best you can get.
Plus the Accel has a lean alarm, program it to an RPM and air/fuel and it will shut the motor off or activate a light, you don't necessarily have to keep an eye on the gauge.
Additionally it will feed your ProFlo an O2 signal, even though the ProFlo will only read a narrow band.
And it will datalog and save it to a file, only needing laptop to read it. It also has other inputs and outputs.

Hope this helps.
Mark