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Hey guys, I bought an OEM dash mount tach for my 93. I mounted it on the dash near the A pillar, ran the wires through the dash to the flat 4 pin connector near the fuse box.

My tach did not have a plug in on it, previous owner cut it off I guess.
I found a thread on here somewhere that showed the wiring, so I cut and spliced the wiring as per the diagram.

The tach works......but only when I turn the running lights on and there is no backlight in the tach. At night I cant see anything.

So, can I splice the running light wire to the 12v switched wire to have the tach work all the time? And is there supposed to be a light inside the tach? maybe its just burnt out.

Thanks
 

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Here is the factory diagram.





 
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