oil sending unit

[towpainter3]

After reading the post on the temp sender unit it brought to mind a question on the oil sender on my 74.
I have swapped out 3 different senders [used]and get different positions and slow response from the needle on all 3.
I May be wrong but I think that the guage should react to pressure changes relatively quick just as the mechanical unit does.
According to what ive seen and been told there is only one sending unit for the scout2 engines and it covers all years.
Not really concerned about this since I have a mechanical guage , but just one of those anal guys who wants everything to work and work right.

 

[Michael Mayben]

The oem gauges are powered up by a nominal 5vdc reference signal, when combined with the resistive values incorporated into the various sensors per standard design, combined with the tiny oil pressure sender orifice, that means the actual display action of the gauge is extremely slow in response time. And even slower when combined with a typical mechanical pressure gauge running off a tee fitting connected to the same port location.

This is a characteristic of this type system. When both a mechanical gauge and the oem gauge systems are run in parallel, this is very obvious. And doing so allows you to determine what the actual values of the oem oil pressure gauge needle positions correspond to. For instance, dead center on the gauge used in both Scout II and d series pickalls works out to 50psi nominal.

 

[towpainter3]

The sender on mine is installed in the front port nearest the filter. The mechanical line is at the rear port. My factory guage is reading at most just above the 2nd Mark on the face. Was just wondering. I know my oil pressure is good its 20 at idle hot and 55 to 60 goin down the road. [ reworked oil pump] Figured the factory guage should read a little better than it does.