My brother has the above car, and his wife got him a autogauge 8,000rpm 5in tach w/shiftlight for christmas. Model # 233905. It has 4 wires for hook-up. White wire to 12volt dash lighting, Red wire to 12volt ingition switch, Black wire to ground, and a Green wire to tach terminel on the black box. Where is the black box located? Under the hood ,where? I,ve found in a service manual that a white wire is used for the stock tach connection. I cant seem to find the white wire under the hood Please help if you can, Thanks. Also as a side note I,m not sure this model # tach can be used with the LT1 engines. Any suggestions. Monday he will call Autometer to see what they say

My brother has the above car, and his wife got him a autogauge 8,000rpm 5in tach w/shiftlight for christmas. Model # 233905. It has 4 wires for hook-up. White wire to 12volt dash lighting, Red wire to 12volt ingition switch, Black wire to ground, and a Green wire to tach terminel on the black box. Where is the black box located? Under the hood ,where? I,ve found in a service manual that a white wire is used for the stock tach connection. I cant seem to find the white wire under the hood Please help if you can, Thanks. Also as a side note I,m not sure this model # tach can be used with the LT1 engines. Any suggestions. Monday he will call Autometer to see what they say