Just had a failure on a Volvo-Penta tach/hour meter, which is a bear to repair because the case is crimped closed to seal it. Once when I wrote to Volvo-Penta complaining about the cost of parts, their example of why Volvo parts are worth the price was the gauges - that there is a special double glass to prevent fogging, or something like that. In any event, the gauges are so good that they are almost impossible to fix.
One place that has repaired these tach/hour meters for me in the past is:
Palo Alto Speedometer
718 Emerson St.
Palo Alto, CA 94301
650-323-0243
Fax: 650-323-4632
bilofsky@toolworks.com
Where to Repair Volvo-Penta (VDO) Instruments
Moderator: Jim Walsh