Grounding problem? I have a 1985 ss monte. The tach and temp gauges don't work. The choke works sometimes as well as the left blinker indicator light on the dash. Could it be a ground? Where is the ground from the motor to the chasis?

There should be a small ground wire from the battery negative to the body. It is usually part of the negative ground cable.
Many years ago, and your 85 could be in that range, a ground strap was located at the rear of the right or left cylinder head and grounded to the body to commonize the ground between engine and body.
Check to see if either one are present and let me know, we can go from there.
Regards,