1980 SG. Multiple problems: Neutral indicator light not functioning, checked fuses, remove the bulb, test with other bulb, no go on the light, key is on... Where do I find the neutral switch ? Nothing shown in service manual. Tachometer is slow to respond to engine rpm. Is opening the tach. housing an option for inspection / cleaning lubing purposes ? Is the bezel removable ? Glass also needs cleaning due to moisture / condensation. Thanks, Bill