if the gauge is a vdo, then it is a standard vdo sender. it is important to match sender brand to gauge as they use different resistance values. my genny had a cyberdyne digital gauge and a vdo sender. it didnt read properly. i replaced the sender with a cyberdyne one and it worked fine immediately.
oil pressure senders are typically about the size of a spool of thread.
of course, dont use any sealant or teflon tape on the threads. statement of the obvious.
later
tom
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