Well the P38A's only came out with V8's, so I would imagine that would make it even easier to fit... You'd probably find there is something on the V8 motor around that area that it bolts to.
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So to back up, the P38 HAS a dipstick, Using the same basic engine and auto thats "sealed for life"?.
If I could remember the thread size of the plug in the D2 auto sump (metric definately (anyone (m10 x ??))). I could chase up some adaptors and make the tubes. Then it just needs sticks.
I used one of these once upon a time in a falcon!
LOKAR FLEXIBLE BRAIDED TRANSMISSION DIPSTICK C4 FIREWALL MOUNT LK TD-30C4FMPAN | eBay
I'm not right up on the working pressures of the trans cooler but would it be possible to make up a T-piece, to screw in between where one of the cooler pipes screws into the box or cooler, to take the sender unit ?. (with apologies for the hijack.)
Absolutely. It's a 14mm tube & steel so you could get a compression fitting T-piece and adapt it to take a sender.
One of the auto places fitted one to my disco2 when I was having problems. I'm sure they said it came off a range rover, but I'm not sure which type. The tube looked like it came up the firewall from what I remember.
In the end it was removed because the dipstick kept unseating from the tube despite the transmission breathers and so was not sealing properly.