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Pathologic Opeler
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1,960 Posts
Discussion Starter · #1 ·
I am refinishing an ebay opel tachometer to replace my current fogged and fadded tach.It will be saw-weet when I am done.

there are 4 wires in the back of the tach
1-grey wire is pos for the bulbs
2-brown is case ground
3-green is coil wire
here is my question:
4- what is the red-black ? I have tried to trace it on my destec diagram..makes no sense.
 

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Banned
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3,842 Posts
On the back of your tach you should have places for three wires to be plugged it, excluding the lights. Two are side by side and 1 is in a line with them but off to one side. That is your black with red, it is a 12 v positive for the function of alot of the gauges in your dash. It goes to alot of things in the dash.
 
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