oil pressure sending unit

[ldfly112]

My question is there any difference from a panhead oil sending unit and ul flathead sending unit Thanks if you can help

[duffeycycles]

yes, there are different versions for different eras,but the main difference is length of the hex to the threads is longer on OHV.Palmers book shows many of these differences

[Rubone]

The threads are also different on newer units than early ones. Late are 1/8NPT, early are a straight thread. Don't mix them up. H-D made an adapter to use the late switch on early engines. And the 45 (WL/WLA/etc) are also the same as UL.

[otis71]

The only aftermarket adapters I could find were straight thread to straight not straight to npt as I was hoping. I was able to run a tap down the female end and make it pipe thread. If memory serves I was running an earlier pump on a 60FLH.