[Richard L]

1. yes. If the threshold is altered, you need to reset the WL, WH and possibly the SC. Depending on the tolerance of the WL and WH set, adjust the FSDL to minimise flow spikes.

2. Yes, correct, gain is to scale the incoming signal to reach peak flow earlier. But there is also a danger of hitting flow ceiling earlier. Ideally, the red led (95%IDC) to coincide with the maximum fuel flow.