syncing PO to TD-3

I bought a PO-12 with intention of combining it with my TD-3, and as a dumbass who i am i didnt do much research before buing it. Now i know that i need to boost the signal and i know it can be achived by passing it through overdrive pedal.

I dont really want to send it back, so maybe if someone know how to deal with it, and by it i mean wiring it up i would be very thankful