how to wire up a digital water temp gauge

[modfather]

im want to wire up a digital water temp gauge and not sure what wires go where:scratch:
it has 4 wires on the back of the gauge red,yellow,blue and black. i did think that the red is the 12v input and the black is the earth and the other 2 go to :scratch: any help greatly appreciated :)

[clee]

The others will be signal and back light .Blue I would guess for signal so to the sender and other to dash lights .

[modfather]

The others will be signal and back light .Blue I would guess for signal so to the sender and other to dash lights .

ok so the sender do you mean the switch on the water pump

[clee]

The temperature sender wherever that is so usually on the pump .Did you get one with the gauge ?

[modfather]

The temperature sender wherever that is so usually on the pump .Did you get one with the gauge ?

no dint get any other bits for the water temp gauge just got wires out the back of the gauge

[clee]

Try it on the existing sender then and see if it reads sensibly .

[modfather]

:agree: thnaks very much :D do you think its best to have a fuse put in on the 12v input if so what ampage 10amp 20amp etc

[clee]

No need to fuse it .

[modfather]

fair enough i will get on to it over the weekend dont fancy getting wet today

[clee]

Take the sender out and do it on the bench ,check it reads right before you install :agree:

[modfather]

:agree: thanks for your help mate :)