I have a Factory Tach and matching guages out of a 79 K30. The truck was in a fire and the guage housing was melted but all the guages look fine. I have the tach, fuel, speedo, oil, temp, and amp guages. I would sell them for $150. A printed curcuit is $79 from ChevyDuty.com. So for under $250 you can have a factory tach in your truck. Let me know if anybody is interested?