I think I know what I am going to do.
Here is what I have to put on my controller.
It has 6 channels. Each with an rpm, and a temp display.
So I have two sets of fans, to be put on two different channels, controlled by water temp.
So that fills two channels.
Than two pumps, one channel each.
They are also controlled by water temps. And of course each their own pump rpm display. Thought I don't really care about pump rpm, just pump noise.
That takes care of two more channels for an other two channels free.
What I have left is 4 flow sensors. But only two more channels left with only one rpm display on each.
So I came up with two options.
Option A is I get two switches in an empty 5.25 bay two have each of those two channels read two different flow sensors. And the two switches allow me to flick between the rpm signal of the two flow sensors. A simple switch like this
Option B is I put all 4 flow sensor on avsingle channel with a 4 way switch that allows me to select which rpm to send the channel. This would be my prefered option. But I have not found the switch in question yet. Need something small, and low profile.
Eitther way, those switches are cheap, reliable, and unintrusive.
Thanx guys.Edited by PepeLapiu - 3/7/14 at 6:59pm