avicenna110
SILVER Star
Hi all,
My car is a 65 FJ45, with a SBC 350. I want to use the stock gauge so I followed previous posts here on mud on how to make it work. I have a new Toyota sender unit plugged onto the block as shown below
I have a new oil pump installed. The needle does move upon start, but stays just above L, it doesn’t move when I rev it ( not sure if it’s supposed to). I know one way to test oil pressure is to install a mechanical gauge but hopefully I can avoid it for now. Here is what I’ve tested so far:
- resistance between yellow connector above (when disconnected from sender unit) and positive of battery is 47.6 ohms (this is really the resistance between the two legs of the oil pressure gauge at the instrument cluster)
- when I disconnect the yellow connector above and ground it (while engine is running) , the needle goes to H. I stop before it reaches H.
- the resistance between oil sender unit and battery ground when engine is off is high (inf)
- when engine is running, the resistance between oil sender unit and battery ground is 21.8 ohms. Revving the car doesn’t change it (again not sure if it’s supposed to)
So it looks like I have pressure as the resistance of the sender unit goes quite low but I’m not sure what to interpret the numbers above and how to proceed. Any help is much appreciated.
Thanks
Daniel
My car is a 65 FJ45, with a SBC 350. I want to use the stock gauge so I followed previous posts here on mud on how to make it work. I have a new Toyota sender unit plugged onto the block as shown below
I have a new oil pump installed. The needle does move upon start, but stays just above L, it doesn’t move when I rev it ( not sure if it’s supposed to). I know one way to test oil pressure is to install a mechanical gauge but hopefully I can avoid it for now. Here is what I’ve tested so far:
- resistance between yellow connector above (when disconnected from sender unit) and positive of battery is 47.6 ohms (this is really the resistance between the two legs of the oil pressure gauge at the instrument cluster)
- when I disconnect the yellow connector above and ground it (while engine is running) , the needle goes to H. I stop before it reaches H.
- the resistance between oil sender unit and battery ground when engine is off is high (inf)
- when engine is running, the resistance between oil sender unit and battery ground is 21.8 ohms. Revving the car doesn’t change it (again not sure if it’s supposed to)
So it looks like I have pressure as the resistance of the sender unit goes quite low but I’m not sure what to interpret the numbers above and how to proceed. Any help is much appreciated.
Thanks
Daniel