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Turning off at 13" seems kind of early since the booster is normally supplied with way more than 20" on deceleration. How much vacuum is the pump capable of pulling? May be look into the adjustable switch that SMC makes, also adding a vacuum tank could help.

Exhaust leak?

Single rounds or single Euro squares IMO.

I think it's the Crank Position Sensor.

Thanks! They are not painted- Yakima boxes did come with white tops back in the 90's but not any more. Don't know what percentage of tint I have- just bought the car like that.

There are few pictures of tinted white 945's in the last couple of pages of the Showroom thread: https://turbobricks.com/index.php?threads/post-pics-of-your-volvo.56763/page-500

^^^ I think coil to the O2 heater jumper is the shortest distance under the hood to make this happen.

Unplug and remove the RSR from the car and measure resistance between #4 and #3 (That's where Red and Grey wires plug in). If there is a small resistance of just couple Ohms then your relay is closed without being powered. You may want to measure in few positions- with relay upside down, on...

Sometimes it's difficult to get both the gauge sender and the warning light dual post unit in certain pressure ranges. I think VDO only makes single post sender in 100 psi version now. But for 80 psi or 150 psi they are available as dual post sender/sensor. Over the years they also made many...

VDO

Look for the alternative source of battery voltage at the coil and the injectors. Plugged in and working RSR is the only thing that should make "+" present. Hope you are good with the test light and the wiring diagram.

Without working RSR relay the car should not run at all. Are you saying it starts and runs with it unplugged?

Something if funky about the ignition switch- you shouldn't have any dash lights with the key off. Any modified wiring?

Intercooler is going to make a good difference, so will the 3" exhaust as long as the down pipe matches that diameter.

Air Conditioner ON signal to the ECU can raise the idle speed.

You probably got connection issue with one of the battery cables. Pretty weird that you can start the car but a minute later it can not run off of the alternator and dies and can not even power the lights and the clock from what you are saying.

Sounds like the battery cable is bad, but the alternator should have kept the engine running. Start checking things with the probe light if the new battery doesn't fix it.

So no lights on the dash? Does the clock work?

Euro heads

'87-'90 Chevy Celebrity assemblies can be adapted if you like the look. They use glass lens, 9006/HB3 and 9005/HB4 bulbs so you can drop anything in them- LED's, HID's, tons of halogen bulb options.