Oil Pressure Gage

[76 MS. bronco]

I have a 76 Bronco with a 302. I am getting a pegged out gage when i turn the key on, just like it's shorted to ground. when i crank the truck it starts slowly going down to 0, it takes about 30 seconds to get all the way down. if i just straight crank the truck the gage jumps to 40 and then slowly drifts to 0. i put the wire straight to ground and it pegs out like the gage is good. i put a new sending unit on it and it acts the same way as the old. ANY SUGGESTIONS??????

 

[Seabronc]

the only thing I can think of is that the unit is not getting a good ground. Did you use Teflon tape on the threads of the new sender? They are designed to self seal so no tape or **** is necessary. It depends on the threads to make a good ground. There should also be a ground strap from the intake manifold to the fire wall to improve the ground path for the instruments.

Good luck,

>-

 

[76 MS. bronco]

I did use teflon tape the first time but not the second. no difference.

I have a ground strap from the fire wall to the engine block where the battery grounds. will that suffice???

Thank you for the input.

 

[Seabronc]

There really should be one from the intake to the fire wall. Also, the on you mentioned should be removed cleaned and re- installed, that may also help. Check the condition of the cable at the connector to make sure it is not corroded.