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Dave Barton sells a calibrated gauge face that is cheap and accurate (as the factory gauge is good quality - it just happens to lack gradation). Seach for Dave Barton and Volvo and you should turn up his website. Or you can go aftermarket.
Your fuel system uses 300 cc/min injectors at 43 psi, with a 1:1 regulator to maintain this under boost. You can run higher pressure through an FMU, run an additional injector kit, use an Apexi SAFC and larger injectors, lower base pressure and use slightly larger injectors, run race gas, or use an aftermarket EMS. 300 cc/min is about 29.5 lb/hr. At best, each will support 60 hp, though 55 hp is a safer number for a turbo motor. They will run wide open and can do so reasonably safely since they are low impedence high quality Bosch.
Your ignition system is a cam driven distributor system with a Bosch knock sensor ignition that has 9.8 degrees of retard authority. That is enough for stock boost or 50% more, but probably not 100% more boost. The timing curve runs on top of the base timing, which is adjustable on 84-89 740/760/780T. You can lower base timing and lose response. Better is to use a boost retard ignition and run more initial advance and then take it out under load. Best is a programmable ignition system, either separate or part of an aftermarket EMS.
No chips are available for the 84-89 USA turbo cars. You may be able to have your ECU modified to take a chip, but I don't think it is simple or cheap. BSR in Sweden can help you. You need two chips, however, one for ignition and one for fuel. The ignition one is easier to convert on an older car like yours. Converting to newer Bosch ECU like on 90-95 USA turbos will allow easier chipping, but you still need two chips and the conversion of the fuel ECU is not a simple job. I would not bother with chips.
Philip
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