[JasonACT]

You might be able to imagine, I'm pretty chuffed with myself at the moment. And I don't even have any photos to share...

static eep eeprom [] = {
{ 0x0000, 0x02, 0x00 }, // 0 Header
{ 0x0002, 0x26, 0x00 }, // 1 ODO
{ 0x0028, 0x14, 0x01 }, // 2 VIN (Full)
{ 0x003c, 0x0a, 0x01 }, // 3 VIN Again, Only Last 6 Letters/Digits
{ 0x0046, 0x08, 0x01 }, // 4 ID C00C
{ 0x004e, 0x12, 0x00 }, // 5 IDs C105, C199 & C19E reference this
{ 0x0060, 0x1c, 0x00 }, // 6 ID DE04
{ 0x007c, 0x02, 0x00 }, // 7 ID DE03
{ 0x007e, 0x04, 0x00 }, // 8 ? Values: 0x78 0x78 0x78 0x4A
{ 0x0082, 0x08, 0x01 }, // 9 ? 511
{ 0x008a, 0x1c, 0x00 }, // 10 ?
{ 0x00a6, 0x32, 0x01 }, // 11 ID DE00
{ 0x00d8, 0x24, 0x01 }, // 12 TACHO TABLES (RPM*4, DialPos 0..4349)
{ 0x00fc, 0x34, 0x01 }, // 13 SPEEDO TABLES (Speed/2, Corrected/2+1, DialPos 0..4286)
{ 0x0130, 0x24, 0x01 }, // 14 ID DE05
{ 0x0154, 0x2e, 0x01 }, // 15 ?
{ 0x0182, 0x18, 0x01 }, // 16 ?
{ 0x019a, 0x36, 0x01 }, // 17 ID EE25 & D902
{ 0x01d0, 0x0c, 0x01 }, // 18 ? Divisor of 194
{ 0x01dc, 0x14, 0x01 }, // 19 ? Flags
{ 0x01f0, 0x04, 0x01 }, // 20 ?
{ 0x01f4, 0x14, 0x01 }, // 21 ?
{ 0x0208, 0x02, 0x00 }, // 22 ODO Checksum
{ 0x020a, 0x06, 0x01 }, // 23 ?
{ 0x0210, 0x04, 0x00 }, // 24 ? (May have a boot counter)
{ 0x0214, 0x06, 0x01 }, // 25 ID DE01
{ 0x021a, 0x02, 0x00 }, // 26 ? (May be options)
{ 0x021c, 0x2e, 0x01 }, // 27 ?
{ 0x024a, 0x1c, 0x01 }, // 28 ?
{ 0x0266, 0x1c, 0x01 }, // 29 ?
{ 0x0282, 0x1c, 0x01 }, // 30 ?
{ 0x029e, 0x1c, 0x01 }, // 31 ?
{ 0x02ba, 0x04, 0x00 }, // 32 ? (May be to do with the VIN)
};

EEP_000D8_CHECKSUM_0x94,_0x70
EEP_000DA
0x00,_0x00,_____0_?____0
0xA0,_0x0F,__4000_?_1000
0x40,_0x1F,__8000_?_2000
0xE0,_0x2E,_12000_?_3000
0x80,_0x3E,_16000_?_4000
0x20,_0x4E,_20000_?_5000
0xC0,_0x5D,_24000_?_6000
0x60,_0x6D,_28000_?_7000

EEP_000EA
0x00,_0x00,_____0
0x65,_0x02,___613
0x0B,_0x05,__1291_(+678)
0x6B,_0x07,__1899_(+608)
0xCF,_0x09,__2511_(+612)
0x34,_0x0C,__3124_(+613)
0x98,_0x0E,__3736_(+612)
0xFD,_0x10,__4349_(+613)

0x02,_0x00,__?????

*****_IF_THIS_IS_RPM_***
!!!_4349_now_is_8000_while_before_it_was_7000
!!!_4349_/_8_=_543.625

0x00_0x00____0
0x1F_0x02____543
0x3F_0x04____1087
0x5E_0x06____1630
0x7E_0x08____2174
0x9E_0x0A____2718
0xBD_0x0C____3261
0xDD_0x0E____3805_<<_This_is_the_new_MAX!
_____________4349_<<_AS.._This_can't_happen now.
*************************


I've just recalibrated my XR6T 7K tacho to match an FPV 8K tacho fascia and it appears to work perfectly (on the bench).