Re: Oil pump change on 56 Packard 400

Posted by HH56 On 2023/10/2 11:13:42

When you say repro sender, what are you using and where did it come from. If you are using the Napa Echlin brand OP6091 senders, those are a standard aftermarket sender and also used on other cars of the 50-60s era, mostly Ford products since many models used gauges with the same electrical needs. The senders should not be failing unless there is something else going on and if that is the case, I would wonder how long a NOS sender would last.

One concern I always have with anything that old and NOS is deterioration. On the oil sender, no idea how the oil is confined or pressure is transmitted to the components inside to change the electrical output but that is something to consider. If it is a metal diaphragm or maybe a Bourdon tube arrangement then no worries other than possible oxidation on wipers or contacts. If it is a rubber diaphragm that separates the oil and flexes to work the electrical components then I would wonder how long the old rubber would stand up.