does my 1991 lt have a red light only or will it have orange then red lights

The dual warning lights ended in the mid '80s. Your red low fuel light should come on when there's about 4 litres left in the tank. The slot is there for the additional idiot light but it's blank and likely the sender doesn't have that two step function in a '91 model anyway.

thanks for that
red light comes onoccasionly got another sender unit but cant get red light to come on while moving float arm up and down
i did this with both sender units out of tank
is there a test ican do to get red light to come on

Suss out the four pin connector that sits on the right hand side of the bike under the side cover, back end of the tank. it contains the wires that run the fuel pump, sender and the auxiliary gauges too. This is a best guess.

i try that tomorrow night and see if the wires are loose or broken
thanks again time for bed 330am start tomorrow