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52mm tach bulb? 200 1991

posted by  neptune242 on  Thu Dec 30 19:07 CST 2004
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last visit: Thu Dec 20 13:00 CST 2012
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I've never actually seen the bulb in a 52mm tach, but from your description it sounds like a ba7s type bulb. I know the bulb in the 52mm ambient temp gauges are ba7s, and I think the gauges are similar, and much deeper than the other 52mm's, thus the larger bulb.
Check with local auto parts store, tell them you need a ba7s. Volvo parts dept (four different ones) are still scratching their heads over my ambient temp gauge bulb. Still haven't replaced the bulb, but I bought the lighting catalog to figure it out.
base of the bulb has little "wings" or ridges on a ba7s, as opposed to a ba9s (interior lights, such as glove box, seat belt warning lamps, etc.) which has round tabs like the 1157 turn signal bulbs.
--
1981 242 GLTi 1967.5 122S
Seattle, WA






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