The reason that the later cars came with an underhood
MAP sensor is because the long vacuum line that ran into the passenger
compartment sometimes experienced condensation in the line. Mopar may still
sell the underhood conversion for those of you out there who don't have
the underhood one. The other choice is to get one from a turbo car at a
salvage yard. It's possible to remount your existing one under the hood
with minimal hassel. The difference between the two is that the underhood
ones (ie CSX TII computer) were wired to the connector on top of the computer.
The passenger compartment ones however were wired and mounted to an opening
at the bottom of the computer. So if you want to run a CSX computer in
a car with non-underhood MAP then wire the existing three wires to the
red and blue computer connectors (5V Pin 1 RC, Gnd Pin 25 RC, Signal Pin
19 BC). If you are running the GLHS or L-body computer then you wire to
the three pin connector at the computer lower cavity. Both TI and TII MAP
sensors are electrically the same. The stock underhood ones may be a little
more durable, I dunno.
For example, I had a TI L-body (now converted to
TII L-body) and remounted my existing MAP under the hood, reconnected it
to the Baro-read solenoid with a shorter tube, and extended the existing
wires through the firewall. I've been running it this way for 10k miles
with no problems.
