Hi @LPGC, you seem to be the god with LPG conversions (although same question is for anyone who knows LPG well). Mines started to switch over after a longer time than normal. It used to switch within about 2-3 minutes, temp needle just off the cold pin, however it's now at least 8 mins and engine temp needle is just under half way.
It's PRINS if that makes any difference!!
I've had a search for the diagnostic software but drawn a blank.
Thank-you in advance