Intercooling a D24T... a couple of questions

[tofufi]

Thanks for the help I've never seen the word 'turbo' on the dash lamps - I'm guessing it should come on with ignition and go off with the engine started like most other lamps (and a later 940 TD I owned).

I'd imagine I could test the lamp by bridging the contacts?

[adamdrives]

It's a blow off valve to prevent overboosting. Are you staying at stock boost? If so, bridge contact to test. If not, just unplug it as it will always come on as you make higher boost. Better yes get rid of the whole thing and replace with a rubber plug from the hardware store.