intalled VDO gauges have questions

I been trying to get thu to tech support @ VDO but not able to reach them, installed quad gauge set [ 5"] dia. a2c59519670, fits nicely in the factory opening, need know what oil and temp sensor to get from them I am using new oem style, but the temp gauge is way to high of a reading, and the oil pressure gauge just went and pegged to max and is stuck there now, does any one know which sensors to get from VDO ?? also bought the speedometer a2c59519490, which uses a hall effect sensor in the trans in place of the speedometer cable, the wiring calls for the hall effects senor wiring, black is body ground, red to 12v switched power and the white wire to signal input on the speedometer, now the wiring from the speedometer , has a blue/black sender signal wire marked as - and green sender signal wire marked as + any idea which wire to use,