Does anyone know how to test the guide matic photo tube on the dash?
Do you have a Shop Manual? Starting at page 12-82 are test procedures for the guide-matic.
Yes I do, and I found out that the photo tube or the tube below it is bad. The reason I'm asking is to check the ones I might buy at a salvage yard. I haven't been able to find one on line and if I do I'm sure the cost will be outrageous.