EDIT, fixed the picture links.
Was wet and miserable all day, so a good day to tinker in the shed with some beer and thinking music
Got a trip coming up that will involve lots of alternate days driving with and without the trailer, so the plan was to fit up some in-cab controls for the airbags..........just cause I'm old, fat, and lazy. Already had a compressor mounted under the seat, so all I had to do was acquire the bits and work out how to mount them. Pic 1- Here's the electrical and plumbing bits i was planning to jigsaw together.
Started by making a mounting plate for the hardware. Used a scrap bit of 4mm ABS I had lying around. cut it to size and then baked it in the oven until it was all soft and wobbly, then I pressed it into the shape of the floor under the seat and held it in place until it cooled. Then I could do a rough-in of the plumbing and solenoids to check everything was going to fit. Pic 2- Here's a picture of the rough-in.
Pic 3- And then with the plumbing and electrical all mounted and connected-
Once I'd worked out where everything was going to go, the base plate was attached using the bolts from the compressor mount, then the compressor was remounted, everything connected and pressure tested all the joints......typically, one of the joints leaked, and it had to be the one that required complete disassembly to get at to fix
Pic 4- Here's a picture of all the under seat stuff done-
Then it was time to move up to the control panel. It was more arse than a busload of poofters, but the store bought panel was almost exactly the right size to fit into the ashtray hole of a 70 series, just had to trim 5mm from the top edge so the gauge cleared the bottom lip of the hole in the dash and file about 1mm off each side. There was a bit of dicking around with the wiring as there were 4 wires for each momentary button, and 7 wires for the gauge, but it's all hooked up to be powered from accessory. The digital read out for the gauge is on when ever the ignition is, but when the dash lights come on, the display dims to half light, and the 4 buttons are illuminated. I may end up disconnecting the lights in the buttons as I think they may be a bit bright, although they are down quite low so I wont really know until after I've done a decent night drive?
edit- I've since wired the illumination for the 4 buttons to feed from the compressor switch, so they only come on when the compressor is turned on.
Pic 5- Anyway, here's a picture of the dash display-
Cheers