Gauge Cluster Problems

[NW_Ryker]

Hey everyone,
I'm in the final stages of getting my Blazer back together and I've hit a bump with the gauge cluster. The original one someone had painted over and the gauges were rusty, so I bought a new one. This one was out of an earlier GMC (It had the body color bezel). This one also had a tach, the original did not. When I hook it up, only the high beam indicator and brake warning work. The blinker lights and the gauge lights don't. What might be the problem? I know the circuit on the back is slightly different because of the tach, could my connector that goes into the circuit be wrong? Thanks in advance for any help you can give.