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I only have a 1 guage, just a boost guage. Maybe the sender unit to your stock guage isnt working. There is a little wire that hooks onto your oil filter housing, and I beleive that is what gives signal to the guage.
Also I dont know about the light. That is just sensing oil pressure. I know mine comes on when you change the oil and your cranking for a while before it starts to get the pressure to flow through. Id say its just the sending unit. BUT I think that there is 2 senders, one for the light and one for the guage..
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