Oo, oo, ooo! I know the answer to this one. I just went through this. There's a tool to take those apart, I found mine on ebay. https://www.ebay.com/itm/11pcs-Car-Terminal-Removal-Tool-Kit-Wiring-Connector-Pin-Release-Extractor/272821770975?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2...

Update. I sent Atlanta Speedometer my DIM. Gave the package to UPS on a Monday, it was back to me that Friday. It works. $230, including return shipping. Five year warranty.