The oil gauge oscillating may depends on the design of the oil pump.
If there is a slight variation in the output pressure you may see some
vibration at low revs. Another source of a vibrating gauge may be the
pressure relief valve "chattering". Even considerable play in a single
rod bearing may cause it at low revs.
Kees Oudesluijs
NL
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
coudesluijs.vcf]
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