Low level indicator for windshield washer reservoir?

[polizei]

Hey Guys,

I'm planning to install a water-to-intercooler this winter on my turbocharged '87 Carrera, and I'm considering leveraging my windshield washer reservoir to feed the radiator. I'm reaching on this one, but has anyone installed a low-level indicator for their windshield washer reservoir? Snow Performance (manufactures water/methanol injection kits) sells a low level indicator that works with their reservoirs, but I'm not so sure it would work on a 911 reservoir:

Snow Performance: Low Level Indicator

If anyone has ventured here, I'd be interested in hearing what you did.

Thanks!