Just having a think how to read off the oil temperature for my supercharger. I've got two options, buy an aftermarket gauge and have trouble finding somewhere subtle to install it. Or alternatively I'm wondering about wiring in a switch so I can tap into the existing water / oil temp gauges and then use standard pug sensors in an oil temp take off housing.

Any thoughts. Running on the standard instrument panel is probably best. I must just be able to tap into the water temp wire with a single pole double throw switch and can then select between charger temp and oil / water temp depending on which gauge I put it on.

My only concern then is that I don't really know where 80 degrees is on the gauges so maybe I'm better going for a digital gauge that will give better resolution?

I think you're probably right, Just can't think how to mount an aftermarket gauge nicely without it being on show. Might try and put it in down near the gear lever somewhere.