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Originally Posted by lamothe1
It looks like I'm in for a busy weekend. I'm worried about the Black wire that I should NOT have grounded, I hope that it didn't blow the computer. thanks for all the info. I'll post the results 
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Doc here,
Keep us posted!
The quad driver/buffer may have been able to absorb the "hit" provided you didn't run it too long..Their pretty stout..
On those, the usual config is one is reference pulse, the other is sender..AND one more thing, are you sure you got the right sender? GM also uses two..one traditionally on the left head ( 1 pin, Gauge) and one on the right head (2 pin Computer)..check to be sure you have the correct one.
Doc