Ramen Sama

In my 87 NA, i swapped out my digital dash for an Analog because it didn't have a powersupply in it. I replaced the Wiring harness and the insturment panels. The tempurature and fuel gauges don't seem to work. How can i go about checking to see if it's the gauge themselves.. or if it's another problem. I did switch fuel sending units as an attempt to solve the one problem, which it did not.

Ramen Sama

I think I got this problem tackled too...