Have recently coverted my old Mercury airstart to PROjet electric start, only big chance was the RPM pick up.
Made a new compressornut threat 1/4.28 left hand, with a hole in it to see the optical counter from the PROjet ECU and offcourse a electric starter engine with bendix at the front of the intake.
Functions perfectly, had set the max RPM on 150K, the PROjet will take 155K if nessicery.
Still searcing for the right settings on kerostart but for now it starts easyly on gas.
If somebody is interrested in a fully Original AMT Mercury perefery ECU compleet functioning so RPM pck-up, thermo couple, ECU, programming box, fuelpump, connector's, but whitout scuba bottle
then give me a call.
I live often in the Netherlands and sometimes in Spain.
Email kovac066 at planet dot nl
Kind regards Ger Kovacs.