Gauge cluster question.

[AWH]

I just bought a gauge cluster which indicates batteryvoltage,oilpressure and watertemperature,lighted with leds.
Has to be connected to ignition-positive and battery-negative.Did dat.
Also connected to the ignitionpositive are my radio/cdplayer and a fake-alarmled. Both worked fine untill now.That is,they still work but when i add the gaugecluster to it, the radio will not remember its presettings anymore...
What am i doing wrong ? They all HAVE to be on the ignitionpositive.
Is there an alternative ?

Auke.

EDIT,found i always had the memory-wire of the radio connected to the ignitionplus,instead of the batteryplus,all is working fine now..