Looking to setup a basic test unit for dsg gearbox. I require a circuit that can pwm clutch solenoids that i can adjust or (increase and decrease).
these are 12v solenoids.

 

You're just begging for a Really, REALLY, expensive repair-bill.

If You can obtain, and carefully use, proper Tuning-Software,
You "may" come-out OK, but that's a big IF.

But the mere fact that You are asking for a DIY "Hack" indicates that
You don't have enough experience to figure-out that this is a plan doomed to catastrophic-failure.

Get out your Wallet, you're going to need it.
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Thanks for you input, didn't really help with my question though!