Sandwich plate and oil adaptor bolt for '06 ZD30

Hi Folks

I'm looking to fit an oil pressure switch on my '06 ZD30, using a sandwich plate on the oil filter rather than what sounds to be the harder option of the T-piece off the pre-existing oil pressure sensor.

Can anyone help with the spec of the oil adapter bolt I'd need please?

I've bought SAAS gauges, so I'll also use the SAAS sandwich and adaptor.

Cheers

The ZD oil filter is a cartridge filter, not spin on. I never thought you could get such an adaptor for the ZD.???