From S14.net
http://www.s14.net/forums/showthread.php?t=23302&page=2&highlight=tps
He has the Bosch xxx.402 6-pin tps
pin# - use
1 - ground
2 - signal
3 - 5vref
Another bit of info with same TPS part number...
on p/n 1707320 that cross references to BOSCH p/n 0 280 120 402
the pins are:
1 +5V reference
2 ground
3 signal
4 dont know, ground sounds reasonable
5 connects to 4 at WOT
6 connects to 4 at idle
Your megasquirt wants to see pins 1,2, and 3 as these form the tpsensor, 4,5 and 6 are the tpswitch.
Now both the above don't match description wise so....
Measure it...
To hook up your throttle position sensor (TPS), disconnect the TPS, and use a digital multi-meter. Switch it to measure resistance. The resistance between two of the connections will stay the same when the throttle is moved. Find those two - one will be the +5 Vref and the other a ground. The third is the sense wire to MegaSquirt. To figure out which wire is the +5 Vref and which is the ground, connect your meter to one of those two connections and the other to the TPS sense connection.
Good luck!