Anybody familiar with a Vision Micro systems VM 1000? I'm replacing a slick mag which provides tach input to the VM1000. with a UMA magnetic Tach sender T1A3-4. Off the back of an I/O360. It sends a signal to the engine monitor at 2ppr. If the Slick mag was sending 1PPR, how do I set the VM1000 for 2PPR? I have a VM 1000 operators manual but no install/maintenance manual. Am I looking at diving under the panel and opening the VM1000 box????