I bought some (25 pieces) blue rectangular leds in the US...
To replace the red leds of my radiator fanregulator and voltage monitor.
Before:
After:
Meanwhile I connected also my Seetron SGX-120L grafical LCD...
And the digital Swissflow flowsensor too...
Waterflow is 4.39 liter per minute (variates between 4.39 and 4.41 liter/min).
Seems a little low to me, but is probably caused by the flow restriction of the cube-style radiator, and the flowsensor itself whose ID is 8mm (the rest of the circuit has an ID of minimal 10mm and the total length of 1/2" Tygon tubing is less than 1.20m (four inches)).
I still have to set the CPU speed indicator to the right speed (actually 2250MHz)
Overview of the electronics:
Digital flowmeter on the left, CPU indicator on the right, on the lower right the Seetron LCD, and on the left of it (not visible) my radiator fanregulator and voltage monitor.

Do not pay attention to the cabling spaghetti, has still to be finished...
To be continued...
CD