Hi, Karen

I think you could use one and only Pic ...

Let's see ...

Speed : you can't read digits @ more than 2 Hz ... and how often can you retrieve data from the GPS ???
DS1820 : Needs around 1 sec to make it's measure ... same comment for reading.

the PWM clock also can be used as the digits Multiplexing clock ...

Controling Solenoïds : aha ... that look dealing with a turboCharger wasteGate ... which is the PWM refreshing rate 40 Hz ? 100 Hz ? 200 Hz ?

No matter ... the PWM can Handle that with little trickery ( look at the recent convenient Thread on how to do that ... on MkBasic forum !!! )

Sooo, that lets plenty of time to make calculations on temp, GPS Data, Solenoid drive ...
just have a neat "scenario" ( Organigram ) and it's in the pocket !!!

Alain

PS: Mhhhh, Blondes put their hands under car hoods now ??? That's really THE news !!!