Ralley dash gauges

I started by grounding the sender wires briefly with the key on and the needles moved towards the max, then I bought another new fuel sending unit and hooked up the sender wire to the post on the fuel sender and grounded the sending unit then moved the float up and down, I did this to fuel then temp and oil separately and could make all the needles move and settle anywhere with the movement of the float, (the oil pressure gauge did seem to take 5/10 seconds before it starts to move, not sure if that means anything or not), this is when I figured I had the wrong sending units (maybe for idiot lights)replaced oil and temp and still no gauges working