Bouncing oil pressure gauge

[Glen Davis]

This just started today. Nothing changed in the last two months maintenance wise.  Any ideas?

[cbarry]

I would check the sending unit as well as the guage’s wiring connections for good contact and good ground. You might also check the wiring as it comes through the firewall for chaffing.  

Edited January 1, 2022 by cbarry

[N201MKTurbo]

That is rarely good.

[Bill O'Brien]

There is no way the actual pressure could do that fast of oscillations.  The later Js had a cannon plug on the sending unit that got bad connections all the time.  We put DC4 on the pins.