Fuel Gauge Problem '87 Cierra

1987 Cutlass Cierra with electronic dash. I have changed the sending unit/fuel pump and it still doesn't work. Registers 4 bars allways. Is there some sort of relay or something between the sender and the dash? Please help!

So according to the Hanes manual you disconnect the electrical clip at the fuel pump and it should read full on the gauge. You ground the purple/pink and it should read full. My car does this and I have not found anything online that points to other possibilities. Be it that I have picked up my replacement pump/sending unit from autowreckers I must have shitty luck and picked a bad one. Will try another this weekend.

Guess it was bad luck after all. Tried another wrecker pump and had success.