I recently picked up a 79 300SD and after about 1000 miles the glow plug sensor light stopped working. After reading a few threads about this issue I replaced the glow plugs. now it does start better and faster but the glow plug sensor light is still not working. Where should I look next to resolve this??

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1976 300D 115 high miles, broken odometer (sloooow)
1979 300SD 116 155,000 mi. (fast)