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Want to install a mechanical oil pressure gauge in a 12L engine


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At the moment, has the original L/R cross flow radiator that belongs to that engine, sitting on a channel. Can't use the original fluid clutch type fan as engine is centred, but fan would be too far to drivers side. Not running the aftercooler at the moment either, straight turbo outlet direct into inlet manifold. Fitted a new recommended 82 degree thermostat, seems to be opening/closing correctly going by the gauge.

Swapped a bloke a carton of stubbies (beer) for a 16" Davies Craig fan along with all the wiring that went with it. He was going to install it in a C20 Chev with a 292, but never got around to it.

Wired through a relay at the moment, mounted in front of the radiator pushing through the core, has a manual switch at the minute to activate the relay.

Got a Hella download list off the net, plenty of thermoswitches with varying opening closing temps, many in same metric size as the PRC 3505 which is stuffed anyway (boiled the backside out of it in a saucepan with an ohm meter hooked up, dead as a doornail), so a matter of either going through that or just retap the old unit to more common (for me) 3/8NPT or BSP. Already have another bung in that blank hole same as in your photos, but actual positions switched. Unit is in the centre of housing, new bung to one side.

Don't suppose it's all that critical as to whether I use a single pole or dual thermoswitch, only be there to activate the earth side of the relay anyway.

Cheers, Dave64

Edited by Dave64
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May have this minor problem sorted, received an email from the manufacturers of the electric fan set up (Davies-Craig), who tell me they have an adapter from 3/8NPT which suits the particular fan. Shouldn't be too hard to get an adapter from the M22X1.5 to 3/8NPT which would simplify things.

Dave64

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