oil pressure sending unit decode
 

Does anyone know what this oil pressure switch belongs to? 3918895 Gr.3.875 It has two prongs. Could not find it in my GM books. Thanks,Roger

Re: oil pressure sending unit decode
 

Can anyone with a old GM parts book tell me it's application? Thanks,Roger

Re: oil pressure sending unit decode
 

resto4u,

I just got back to my books. Group 3 is exhaust and fuel system related. There is no listing for 3.875. Are you sure of the group?

Re: oil pressure sending unit decode
 

resto4u;

OK I found it in the 1972 Truck catalog P&A 31S:

3.875 SWITCH-LENS-TEE-WIRE., Assy. Governor Overspeed Warning.

3818895 vacuum switch

58-64 Ser. 60-80
65-68 Ser. 60-80 (8 cyl.)
60-70 Ser. 50-80 (8 cyl.)
71-72 All (8cyl.)

Re: oil pressure sending unit decode
 

Thanks for your reply, still not sure what that would be. Never heard of that part before, does look like a oil sending unit. speed governor?????? Roger

Re: oil pressure sending unit decode
 

I know that trucks and busses had an over speed light that lit when the truck passed a certain speed. This was different than the speed governor that kept you from exceeding a certain speed.

I believe this is a vacuum driven switch that cut in once a set speed was reached which turned on a light or buzzer to warn the driver.

Re: oil pressure sending unit decode
 

speed warning on a truck, cool.... [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]