Help!! Factory tach conversion

[Iliveforthis]

I have an 87' short box 4x4 with a three speed manual , it came factory with the 5" speedo and 5" fuel gauge with warning lights, picked up a gm NEW factory tach, with gauges , I was under the assumption it was the same pigtail plugging into the back of the cluster and might have to change some senders and hook up the tach wire obviously, well I've done that and I have NOTHING, speedo (mechanical) works obviously but all the gauges are pegged except the fuel gauge reads 1/4 but it's full, also the rh blinker indicator light is in as soon as the key is on and stays that way, also no blinkers working inside or outside, is there a diff pigtail for the factory tachs that anyone knows about? All help is appreciated thanks
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